Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39a47c15e0ca2d7…

MALICIOUS

PDF

78.8 KB Created: 2021-03-27 15:42:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ae6007fd7d4c4c05bc434f58ec11657f SHA-1: 517704c89fbb4002293974d29893c10fc5c7c839 SHA-256: a39a47c15e0ca2d745d1469b38d4611180a26700047638b383cb01ac1e84bca8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/wix?keyword=can+a+tenant+rescind+their+notice+uk PDF link annotation
    • http://googsnat.space/75335335580zgttk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486566/normal_5ff4591f94e4b.pdfIn PDF document text
    • http://cloudplay.xyz/james_stewart_calculo_diferencial_e_integralayf0f.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426062/normal_603a55e41f7b9.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://uploads.strikinglycdn.com/files/e5d32c8a-11ec-41cc-b91d-c6f3ed01ab63/76373666059.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e86e60eb-4e6d-4ab4-9804-7a66ea19ed46/spectra_electric_stove_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20b98c6f-0f0f-4de6-8c86-53f4e6f5da54/35423637047.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7d9a35c-0157-47d5-be8c-45235adf2795/kemawe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1532267c-f1be-42ff-aa11-d9f9aeffc9c5/how_much_is_j_prince_worth_2019.pdfIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_3cb462f54079429c9e9cebf1eb00832c.pdf?index=trueIn PDF document text
    • https://18aefb47-0221-41c7-ace0-4f78eb33e730.filesusr.com/ugd/bca722_338f97c554b64b1f8d2d099e61d3e8cd.pdf?index=trueIn PDF document text
    • https://f579be4a-c2ec-451d-94ee-532237c06880.filesusr.com/ugd/9f6a24_e32debcca354442180649ca388fbee53.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a6a3cfd-970f-480b-976f-7aeb52735c58/wisizesojodatupizipifij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd3cad65-4531-497f-869e-5924a0c892e8/compare_sole_e95_and_e95s.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aed8fd8-8118-4c9b-b743-e7c529c0bd51/joxemasixamasarewato.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB03 4964 bytes
SHA-256: 1a3e44d58fc8abbccf568d9f8d83415596fe54f3c07bf9c7af91632e1ff4afca
font_01_sfnt_off0000fbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD6 10664 bytes
SHA-256: 35a3ea6cc639bffd1ee4c04bf0fc8297ea5147791aa5c63208d90f3cc32db023
font_02_sfnt_off00012017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12017 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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