Malicious PDF — malware analysis report

Static analysis result for SHA-256 3acca96384aa3ede…

MALICIOUS

PDF

81.5 KB Created: 2021-04-05 20:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ed4db56943cc212eb2494f862de474e0 SHA-1: c9b10ae6c315925d5a039f5197bb41cd7ad1c278 SHA-256: 3acca96384aa3edec41796461630b073e6d10e310c57d0eaee247807dea6adf3
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. ClamAV and ML classifiers indicate malicious intent, specifically flagging it as a phishing trojan. The embedded URLs and the document's structure strongly suggest it's designed to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mezovuduw.ru/123?utm_term=water+pollution+project+pdf+in+english PDF link annotation
    • http://damvglaz1.xyz/mastering_essential_math_skills_fractionsfvwb6.pdfIn PDF document text
    • http://digitaltoolsfor.xyz/cleveland_clinic_doctors_note_templateoqu4n.pdfIn PDF document text
    • http://fc-aromat.ru/baby_bjorn_mini_carrier_mesh_pinkceb7j.pdfIn PDF document text
    • http://wegansit.space/craftsman_lawn_mower_6.75_hp_wont_startbep6h.pdfIn PDF document text
    • http://kuvekuzokagow.iblogger.org/49442143593.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2056ec0-172e-4313-ab44-ffe7ebba0122/22193311581.pdfIn PDF document text
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_511b0deca7c1412b93d619ddd2cbc2d7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/39855929-369a-4d6e-9648-9dcc71db4a87/pinofumefofu.pdfIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_e199c6e6b19e44dd97ae7a6c679bbc08.pdf?index=trueIn PDF document text
    • https://64f3f273-fd79-4cea-bc15-92b2431614e2.filesusr.com/ugd/542254_84ef6a24c65e468998531c5c073297ea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/70a947e7-791b-4bbf-9488-ed8e98f31975/43421569059.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/018d0375-56d5-4241-9600-350b20cbd622/percy_jackson_titans_curse_graphic_novel_read_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0a9411d-13ea-4bb1-885a-9275d2d1d929/27984745620.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66a33dfe-3b40-425f-b90a-3498a6af8455/22415682882.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5efb1f47-a2f9-415a-b8d1-60b3944d9c86/the_complete_robot_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f568144a-c2f7-4039-b7d6-0caecb435ad0/4948590519.pdfIn PDF document text
    • https://ebd157e6-94c3-4ff5-b3ab-516f87acbde6.filesusr.com/ugd/e87473_75fb1f10c15d43f1ba4a39ec7ec5e2b9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/656d936f-c491-4b4a-a8d7-bce24f2af657/mosuw.pdfIn PDF document text
    • https://19527f6f-7821-4b33-8e58-d909ab9a203f.filesusr.com/ugd/b18fc6_d3591ea1467e4ac7bc46a0ce634f0cb5.pdf?index=trueIn PDF document text
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_48a8fc3d76b74ec4a4fbe62e59c416a8.pdf?index=trueIn PDF document text
    • https://777dd155-384c-4f1d-a337-8f27b94bb056.filesusr.com/ugd/1ecdae_2fc77364b5c3491a870122f8c24b5e71.pdf?index=trueIn PDF document text
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_1f4ba1998c514a66b14f74bcd46acbe7.pdf?index=trueIn PDF document text
    • http://bolilolu.epizy.com/4948970666.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD5 5504 bytes
SHA-256: 83cc0bab1c558cb1c343e22a97b977f426b431a5e152332bfec70f8e873f03d2
font_01_sfnt_off0001129f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129F 11020 bytes
SHA-256: 3181c9977c8333a40bda6d65a71b80469b9e3aa6dcd21351c2e8f3bf3ac8d7ea