Malicious PDF — malware analysis report

Static analysis result for SHA-256 79bdc29546731b4e…

MALICIOUS

PDF

121.8 KB Created: 2021-03-22 07:43:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5067e33109f180d64d156c3de9b473e5 SHA-1: 9a6eb75d994c7f55c09d0d1c66d52b4a9e39aaa5 SHA-256: 79bdc29546731b4e405e11ca7b7470476307075f749b1f65df4545f76bb3171f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://maypoin.ru/strik?utm_term=leica+m6+titanium+ttl PDF link annotation
    • https://cdn.sqhk.co/fimegasaz/3Wic7wD/14026529171.pdfIn PDF document text
    • http://wodebawoxisire.22web.org/dell_latitude_e6540_hard_drive_size.pdfIn PDF document text
    • https://cdn.sqhk.co/matelasoguje/i3hehcg/21070509978.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzalolotagi/gdnYB6K/adelantado_4_aztec_skulls_book_4_chapter_4.pdfIn PDF document text
    • https://cdn.sqhk.co/retobumoki/cugjjao/harvard_business_review_crisis_management.pdfIn PDF document text
    • https://cdn.sqhk.co/jumifokujuje/ie0r9gj/investing._com_stocks_finance_markets_news.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_0e1003d58a974ad18d1dd41cbf55db52.pdf?index=trueIn PDF document text
    • http://didiwufujoloj.rf.gd/what_does_the_battery_light_mean_on_a_toyota_corolla.pdfIn PDF document text
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_b826f40fa25f402ba2bee9d4b85226f2.pdf?index=trueIn PDF document text
    • https://6bb2b61b-82bf-473b-8365-63ddb02ddbdd.filesusr.com/ugd/d55797_c38f26758ce644d0aef2abcbab609e30.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8e14be5-88ed-40d4-b33a-a61190cfb036/lab_report_abstract_example_chemistry.pdfIn PDF document text
    • https://05282879-aed3-4f16-ac14-d534add4d4bd.filesusr.com/ugd/0f8b7c_efa1aba6ef264368bc78701072ce9393.pdf?index=trueIn PDF document text
    • https://0f926834-650c-4d5a-b53c-ad60ae412ccc.filesusr.com/ugd/6a44d8_651f3b3f92cf4c54a3ca84e1dae1425f.pdf?index=trueIn PDF document text
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_54e92a6bb663449aafb9fb14cb2d7f33.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/44ad00d7-11af-488e-a674-47a95d655d3f/wujunoxawosegunorajitivu.pdfIn PDF document text
    • https://dd67658a-cc17-4e1c-bca5-42bf299a485b.filesusr.com/ugd/07a440_dbc632a5097b4c01a833615b765c94bb.pdf?index=trueIn PDF document text
    • https://203aa715-7352-46b1-b16b-5d0aeeaa27a2.filesusr.com/ugd/0582e0_6915e1fd7b944d5489b105d5961c63b5.pdf?index=trueIn PDF document text
    • https://dd67658a-cc17-4e1c-bca5-42bf299a485b.filesusr.com/ugd/07a440_426ad732c1fb4dc38f46d4b5959e9f1f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf678931-2936-4605-a086-e95fdbaa3f88/5th_grade_envision_math_book_answers.pdfIn PDF document text
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_919fff93ff6c4787bfb1c6bfe37683b3.pdf?index=trueIn PDF document text
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_3c793ff6fef74536931d29443e9ceba6.pdf?index=trueIn PDF document text
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_44438ec89a77469b996ff6cf4afd2186.pdf?index=trueIn PDF document text
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_12cedd88e7524d819cc1c822d5b3d304.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fb8e37b-e642-4429-af5e-53d8292cc465/hp_probook_6560b_core_i7_specs.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B98 4536 bytes
SHA-256: bec51b57f04f28119765ee4db51a60590782f53f4fa5719393f1d701acd0a5f0
font_01_sfnt_off00018ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AE4 12196 bytes
SHA-256: b12975abd5b3769e18f9bb822549e7c9de44be8415e036a9b9af8a002f678af6
font_02_sfnt_off0001b4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4A7 16312 bytes
SHA-256: bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939
font_03_sfnt_off0001ca32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA32 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176