Malicious PDF — malware analysis report

Static analysis result for SHA-256 8209fcba72339c79…

MALICIOUS

PDF

80.0 KB Created: 2021-03-15 08:36:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4c51463c4b8435671e1b9c54711010a5 SHA-1: c9606dda99ea9818e2fa638972c0e8de8fe9470e SHA-256: 8209fcba72339c795936eec20c1b45ccdfba5684864b195f717a8590e6542eb7
246 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. It uses brand-impersonation credential phishing. 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 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://povejuzulegaje.weebly.com/uploads/1/3/5/3/135301343/489312.pdf.
  • 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://bologen.ru/strik?utm_term=interior+design+courses+orlando+fl PDF link annotation
    • https://povejuzulegaje.weebly.com/uploads/1/3/5/3/135301343/489312.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490736/normal_5feb896c67ed5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495696/normal_60445cd341e09.pdfIn PDF document text
    • https://cdn.sqhk.co/neridisen/uhdgh0L/2887485141.pdfIn PDF document text
    • https://sexeduju.weebly.com/uploads/1/3/5/3/135327292/lunakibuburotu_pedawimetifoxu.pdfIn PDF document text
    • https://cdn.sqhk.co/bimolixumotu/7Pjh1CO/31990184619.pdfIn PDF document text
    • https://cdn.sqhk.co/nidimejuzu/dgekjb3/bass_guitar_beginners_book.pdfIn PDF document text
    • https://bodonoweti.weebly.com/uploads/1/3/1/8/131856710/4175546.pdfIn PDF document text
    • https://sesanejaw.weebly.com/uploads/1/3/1/4/131407178/tijozoxuf_nemog.pdfIn PDF document text
    • https://rupokolox.weebly.com/uploads/1/3/0/8/130813141/132ee1ce4.pdfIn PDF document text
    • https://nolelagisumo.weebly.com/uploads/1/3/4/1/134132353/6411805.pdfIn PDF document text
    • https://furimubabo.weebly.com/uploads/1/3/1/8/131856330/965124.pdfIn PDF document text
    • https://vejazejama.weebly.com/uploads/1/3/1/3/131381369/kufileneloni_kalarijixujeliz.pdfIn PDF document text
    • https://cdn.sqhk.co/kajutizikodu/gjhhghh/pirigeluxibidunijukakik.pdfIn PDF document text
    • https://deremorukoj.weebly.com/uploads/1/3/4/4/134490203/dogodunarezokusozuji.pdfIn PDF document text
    • https://tixanesel.weebly.com/uploads/1/3/4/2/134234664/9325db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372740/normal_600d45d499035.pdfIn PDF document text
    • https://cdn.sqhk.co/butituguxur/ygejgN2/gopetuladovetijivuxe.pdfIn PDF document text
    • https://guxumexowe.weebly.com/uploads/1/3/3/9/133999944/mofepaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371799/normal_6046e54c0591e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/suximawo/anonytun_new_version.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/the_sims_4_turbo_careers_lots.pdfIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/mosunisinarapimoraso.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_off0000fcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB4 5128 bytes
SHA-256: fe41530285db5ad6c878dcc1e90dc6040518b5ce3d446d06f39a168d6c5e454d
font_01_sfnt_off00010e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E37 10708 bytes
SHA-256: 2aee42456ccccf6c2226739c683d4942174e43d4dbfc14988c45c5eb8ca59277