Malicious PDF — malware analysis report

Static analysis result for SHA-256 42f851d0e5a5d1ce…

MALICIOUS

PDF

73.3 KB Created: 2021-05-26 17:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 4197042e3fa4f30be83c7e8fd6bdc19c SHA-1: b9307cae2c89057db0576fe4332560e7212ec16b SHA-256: 42f851d0e5a5d1ced9d437bfeb3e54da6680bec6a79590448bb2a156bc9e7514
246 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a credential phishing lure impersonating Apple. It contains a mass of external links, many pointing to disposable hosting, designed to redirect users to a phishing page. The primary lure appears to be related to 'Wavepad audio editor free mac', likely a pretext to drive traffic to the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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://sokasabakowupop.weebly.com/uploads/1/3/4/0/134012989/kepibu.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://vilenefex.ru/strik?utm_term=wavepad+audio+editor+free+mac PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378153/normal_60144d7a50db4.pdfIn PDF document text
    • https://sokasabakowupop.weebly.com/uploads/1/3/4/0/134012989/kepibu.pdfIn PDF document text
    • https://numeroluxovuz.weebly.com/uploads/1/3/4/7/134733954/xokenifasile-gamezanagafevo-lesulipirog.pdfIn PDF document text
    • https://fopojikanerev.weebly.com/uploads/1/3/4/8/134888820/bosasewewo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407988/normal_5fe8243584977.pdfIn PDF document text
    • https://wunanowadile.weebly.com/uploads/1/3/4/6/134600652/dikiwofofu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473415/normal_6048d2dde9c59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413714/normal_5fd99b7c207f3.pdfIn PDF document text
    • https://dexidexida.weebly.com/uploads/1/3/4/2/134235246/5306714.pdfIn PDF document text
    • https://busedulaxuxelo.weebly.com/uploads/1/3/1/3/131379622/4423317.pdfIn PDF document text
    • https://berajuvexoru.weebly.com/uploads/1/3/1/8/131860787/c57f2d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411500/normal_5fcf5d6243aad.pdfIn PDF document text
    • https://wixumiwob.weebly.com/uploads/1/3/0/7/130776296/1841369.pdfIn PDF document text
    • https://koxepapo.weebly.com/uploads/1/3/3/9/133997229/sulinu-dujagab-mojarepe.pdfIn PDF document text
    • https://mefanajumajadip.weebly.com/uploads/1/3/1/6/131637152/edda35d.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/8998b923-6eb7-4bf5-80b4-186f8043b873/formulas_para_calcular_el_area_volumen_y_perimetro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad09b670-1895-4855-8d15-a5acdf92b85d/41802487113.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daaa056f-a2d9-4831-b40d-04c0ee8c320b/if_life_was_perfect_it_wouldnt_be.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/497209d4-fd46-42db-8c49-a2c3c1412add/29224293182.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68aab9e2-f6d3-44ce-82d3-8e45ae5b3d12/92149622416.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_off0000e06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06E 5164 bytes
SHA-256: 0ba21d966109fec57c5935cd8074aad707887fe2c0660666f6321cf3c35fefa3
font_01_sfnt_off0000f201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF201 11304 bytes
SHA-256: 75451957e5c1857279a9d47a2de7143691276b6327c92d3425d3b0e44f576990