Malicious PDF — malware analysis report

Static analysis result for SHA-256 e787e4255925f6ff…

MALICIOUS

PDF

77.8 KB Created: 2021-05-12 00:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8b4f8febae16a68c38a082cb93d17e44 SHA-1: 8217e46ac3ad06334f09e563e5aa3b39e4472107 SHA-256: e787e4255925f6ff9d445ceac2ca0a0b1795c64962affae0d862ddb5d9cbb790
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to facilitate initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/strik?utm_term=how+to+get+diagnosed+with+adhd+for+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365580/normal_6057f7dd014a4.pdfIn PDF document text
    • https://nofevezim.weebly.com/uploads/1/3/4/7/134770192/3519686.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369783/normal_60506ee4e410f.pdfIn PDF document text
    • https://cdn.sqhk.co/kizajituxab/Zhfgcot/55658008916.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410194/normal_6061561d4e6e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495843/normal_6043600c8f85e.pdfIn PDF document text
    • https://cdn.sqhk.co/bokapapukopa/Vgfjiib/46748143990.pdfIn PDF document text
    • https://kawavaturitavo.weebly.com/uploads/1/3/5/3/135321378/wujir_sekeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501482/normal_6013601c92998.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/q03iagi/39834155508.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421472/normal_60091ca7dfc67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379489/normal_60603aafbbb4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477181/normal_600ef597f3d8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374682/normal_6037c5db8439f.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/Tqi4Ohc/fun_facts_about_yourself.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408706/normal_5ffe46fc61ad6.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/gihdSgi/68214001229.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/3eb3dc0e-ff64-4386-b407-f284a95f33ab/kenwood_ddx372bt_wiring_harness_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/740f79b1-f709-44e5-ac51-c213cfd57ef4/burger_king_breakfast_hours_weekend.pdfIn PDF document text
    • https://b2691e05-be35-46d2-a26d-08c503de0475.filesusr.com/ugd/b15c0b_b04c42b3e521451eabefe1f03ae6e85a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3be40441-ae40-4a98-9461-1c42a56578e4/how_much_does_acura_b13_service_cost.pdfIn PDF document text
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_eebb6d888d0c483899b58b604d118adb.pdf?index=trueIn PDF document text
    • https://6f29901e-f5c9-4775-879c-97b2de5c8d5b.filesusr.com/ugd/0bf195_9414f90f65ae4365b22d8b72806d50e6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5eb6148-cadd-4c5f-8d15-05bf0686927e/the_golden_fleece_book_review.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_off0000f2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D3 5192 bytes
SHA-256: e0ce150593fa29742bced255c50da470bc1860f9c8b1596b42c0fc1c77f2f5b3
font_01_sfnt_off0001048e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048E 10316 bytes
SHA-256: bb09429d66b06f8220e9a9abf156c4087c7d740e8f873dc41271560dc9b571e6