Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe5c1ca692136980…

MALICIOUS

PDF

95.2 KB Created: 2021-03-24 15:53:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5683ff15df9957796864c5d82067e321 SHA-1: 2df45733eab7bbe24fec6f35999754993efc3a60 SHA-256: fe5c1ca692136980b58423eb5d01ff1f7e4a03742d77e780f3165ce71b74de1f
186 Risk Score

Malware Insights

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

The PDF document was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, indicative of a link farm or SEO spamming operation. While no scripts were explicitly extracted, the presence of numerous external URIs suggests potential for redirection or payload delivery, aligning with common phishing and malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/strik?utm_term=crochet+patterns+diagrams+free PDF link annotation
    • https://cdn.sqhk.co/zevukodixu/fWNjhzl/car_driving_simulator_2016_uptodown.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371013/normal_602643749df51.pdfIn PDF document text
    • https://cdn.sqhk.co/gerukoso/UbgFFqC/95821994993.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393506/normal_6059502e82028.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489251/normal_600b136593a7a.pdfIn PDF document text
    • https://cdn.sqhk.co/fetesulatol/jFugi3S/audix_om6.pdfIn PDF document text
    • https://cdn.sqhk.co/jeforije/ih2hgRT/english_song_video_download_tubidy.pdfIn PDF document text
    • https://sarejazaxixosib.weebly.com/uploads/1/3/4/6/134633098/8961548.pdfIn PDF document text
    • https://zedodunojoponex.weebly.com/uploads/1/3/6/0/136083391/3f821429947cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381102/normal_6038c8ad2114a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378831/normal_5fce87cd992cb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e8e87dc5-637d-47ba-9de6-e7d98d123d78.filesusr.com/ugd/a69a03_99ee182c57e242db864534c29024b296.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/10790102549.pdfIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_69e221d9318d42559a486c28e07ff428.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/40954578573.pdfIn PDF document text
    • https://0bc2ebcf-5b85-435c-8290-6c6350a165f2.filesusr.com/ugd/ee98f5_6ee118bc0bb24c43b6319d5485154725.pdf?index=trueIn PDF document text
    • https://827a6da4-a69c-4806-aaaa-db522494bc4d.filesusr.com/ugd/cb5916_f4589ee54d48480ba34c8a38ede06692.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rorives/79308750403.pdfIn PDF document text
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_7d9f5ba91f8b4a8e84e12cb19b7eb899.pdf?index=trueIn PDF document text
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_2346f5d58dc744ecbb3f443178801fe4.pdf?index=trueIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_b8abf675240f4376bb411e94ca87851d.pdf?index=trueIn PDF document text
    • https://c3f0ce02-b953-40d9-b94a-e38a054f9a35.filesusr.com/ugd/7afb62_afaeca56e5ac44fc804e5395ec080d53.pdf?index=trueIn 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_off0001379c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379C 5440 bytes
SHA-256: 5d9e4da52e6d4af17e7fc771e6715a44675917fc06decb3af98a7488341f9232
font_01_sfnt_off000149f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149F3 10928 bytes
SHA-256: 5d13c6542c1f05bb5e75ddb83697deb45e53b0cf1427361fb849b5e8c37caa40