Malicious PDF — malware analysis report

Static analysis result for SHA-256 7de3dd7111111dd7…

MALICIOUS

PDF

84.8 KB Created: 2021-05-30 07:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 1ea57f4c283a65355afbe8b04d831816 SHA-1: dcb6c700d9fcee0c9dfa621ff042e1d73d07d4f8 SHA-256: 7de3dd7111111dd7c0db8eb3cbeabc128f369e6be23379ca7c0e49ddd29c77af
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting or redirectors, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://zajinet.ru/strik?utm_term=3d+printed+car+toy PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4444123/normal_5ff4ceca433ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495691/normal_60397aebe04eb.pdfIn PDF document text
    • https://ginuzakonufa.weebly.com/uploads/1/3/2/6/132681862/lifudikigiz.pdfIn PDF document text
    • https://gidaxejopof.weebly.com/uploads/1/3/4/3/134305554/meverijoganufiju.pdfIn PDF document text
    • https://josabinisepev.weebly.com/uploads/1/3/1/4/131452942/fedowuzirovomu-fipimipuvabuvut.pdfIn PDF document text
    • https://degufulu.weebly.com/uploads/1/3/1/3/131379990/3553509.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443610/normal_6033ab5fa3a59.pdfIn PDF document text
    • https://nunavupogo.weebly.com/uploads/1/3/4/4/134471291/40e7030a886e96.pdfIn PDF document text
    • https://kekoluborefox.weebly.com/uploads/1/3/5/3/135327445/pevakogirit.pdfIn PDF document text
    • https://jowajasodosetu.weebly.com/uploads/1/3/4/3/134308851/lofufupi-lumunifexedope-gajamete.pdfIn PDF document text
    • https://vufevilasok.weebly.com/uploads/1/3/4/3/134314299/7be3a442466e2.pdfIn PDF document text
    • https://jobalexaxikut.weebly.com/uploads/1/3/4/8/134892204/609741.pdfIn PDF document text
    • https://datuzela.weebly.com/uploads/1/3/4/1/134109276/jajupafezuviwigobiz.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/467b3d0f-d610-48db-a57b-e2494d100f05/what_are_the_harry_potter_prequel_movies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74d98dec-9f3d-4e58-a863-5d859ce3d04e/99195032074.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/375d4e8d-a002-4d88-aae1-74d07712ef76/61793094223.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1620c209-52da-49e8-b313-0590b1ab7609/how_to_clean_a_cabrio_dryer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9be0c6b8-76ce-4242-b636-37005f79e1de/21030605413.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aae61d7b-7d6a-42f7-a2a9-ee0d16df4a73/46321078358.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6e42485-8877-467b-880f-80b78d7af0c8/gusuwob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ace2fb2-bbc0-4fd7-93c4-a90241626b07/farmall_super_av_serial_numbers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/006d3a6f-4c41-410d-85fc-5929ee084486/88564656311.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4946a791-1f81-4407-9277-9683d916195a/nogapit.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_off0001035a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035A 4816 bytes
SHA-256: 9fc426b59ffdb889ec9c128713ce43103c76a25adfecc1bf1c3725ed71ed9576
font_01_sfnt_off000113c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C0 10388 bytes
SHA-256: 39acdf27c2b9900f693f9b39f1469bbdfa821f55524d541606a2dd97389bd867
font_02_sfnt_off00013751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13751 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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