Malicious PDF — malware analysis report

Static analysis result for SHA-256 7639bdb99039eca3…

MALICIOUS

PDF

87.8 KB Created: 2021-04-03 11:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1969f9c1a8171b22257ecc9482240daf SHA-1: 5ae3663025cb7ec852f5cf9da074889ab65b3e8b SHA-256: 7639bdb99039eca323c90db19e3873cff97e6ecce936d4d3068e87587e2c6fa9
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 0.9994

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/award?keyword=architects+company+profile+pdf PDF link annotation
    • http://bonmarket.site/multiplying_decimals_worksheet_ks2i2fq0.pdfIn PDF document text
    • http://ashotik.space/how_to_reload_a_stanley_bostitch_staplerjp4oq.pdfIn PDF document text
    • http://granitmetrospecstroy.ru/bergeys_manual_of_determinative_bacteriology_ninth_edition8bqaq.pdfIn PDF document text
    • http://natnat.fun/sophie_s_worldloa7h.pdfIn PDF document text
    • http://by-roof.ru/memomedadogujexofefagy82wu.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
    • http://bozonesowozo.epizy.com/tosovejepujaxidif.pdfIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_cea7216e0c6242c1852187d398fa0000.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/31011630-53a5-43af-a86f-e2bce3d347d9/26003573794.pdfIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_587d0a8d4a1543a9ae5430dd935e041c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/32952885264.pdfIn PDF document text
    • https://dd91dc4b-d2fe-4aab-ab17-22023aa64d5b.filesusr.com/ugd/f05b1d_368f6142667c48b382e2f580fbd94f20.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c15b00f4-9418-49e4-967b-db1b2f033877/verbos_irregulares_espaol_ejercicios_online.pdfIn PDF document text
    • http://toxawilel.epizy.com/fegozanosimojog.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/97492645204.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/kiwelusuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52ccca30-bf71-449f-95e5-617ba8b386f4/bisutesodazakelutelejukip.pdfIn PDF document text
    • http://wonumamirevaz.rf.gd/network_scanner_apk_mod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa798464-b796-4073-b047-54fb6ebae303/xerisikedarofip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0732ec7f-b2af-46e2-b252-270f91866d81/nobelavetefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86dc2060-6a4f-4150-9f99-f8ff27f18a8d/free_angles_worksheets_year_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49d3c011-e3f0-40a9-98dc-dad60cd5acb5/what_not_to_do_at_20_weeks_pregnant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52560db2-e885-4f7d-a3a4-1d7939d446f0/honda_gcv160_repair_manual.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_off00010a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A94 5272 bytes
SHA-256: e2a176d485b237c57fd7894094f67055f1c7590bf1267ec741a6f186f29e1710
font_01_sfnt_off00011c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C58 11504 bytes
SHA-256: fd03a539077515be91c629bbe6b54f23c807cc2d63c126e7f3433f580707e574
font_02_sfnt_off0001438e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1438E 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2