Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a32a79df0631db0…

MALICIOUS

PDF

72.0 KB Created: 2021-06-05 04:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a7af302fa3f3ef6f7c9972b5d54fd1fd SHA-1: e097dd71610a4d70c8dae5fa8b150dd90c2a4b7f SHA-256: 8a32a79df0631db08598080d9e2f80703a386960a272360999315e8f528c9d1d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to drive traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or scamming operations. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://chcial.ru/pbw?utm_term=how+do+doctors+test+for+parasitic+infection PDF link annotation
    • https://tezilejesitox.weebly.com/uploads/1/3/1/1/131163634/femifiregenizunekof.pdfIn PDF document text
    • https://mokomopepu.weebly.com/uploads/1/3/5/3/135333670/malevobove-varavid.pdfIn PDF document text
    • https://buneresax.weebly.com/uploads/1/3/4/4/134478328/joxat_javuwake.pdfIn PDF document text
    • https://xivixomepovi.weebly.com/uploads/1/3/4/5/134518427/4345724.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393632/normal_5fc7a7dbe9230.pdfIn PDF document text
    • https://kobosarajuxinit.weebly.com/uploads/1/3/0/9/130969632/4345d.pdfIn PDF document text
    • https://xipunozelizu.weebly.com/uploads/1/3/1/3/131382486/5730369.pdfIn PDF document text
    • https://jasujidavoja.weebly.com/uploads/1/3/4/7/134770870/2e012c098.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406775/normal_60252049308a3.pdfIn PDF document text
    • https://rebifigu.weebly.com/uploads/1/3/4/6/134663288/dinodefanafezozanej.pdfIn PDF document text
    • https://dorizusedi.weebly.com/uploads/1/3/0/7/130776489/gipujikasowuvanep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426828/normal_5ff3c65dab2d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415745/normal_60383af476866.pdfIn PDF document text
    • https://wemedasexokava.weebly.com/uploads/1/3/4/5/134512162/wasevaroka_jizuzitutiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426267/normal_60baacc8e9d5a.pdfIn PDF document text
    • https://dakubotamijez.weebly.com/uploads/1/3/2/7/132712147/mesojutufemufawagu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483346/normal_6048196d9e3b2.pdfIn PDF document text
    • https://sezulozag.weebly.com/uploads/1/3/0/9/130969806/b78e3c1fa6e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368956/normal_6006a475b2052.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379606/normal_5ff809432fbfe.pdfIn PDF document text
    • https://miwefotuwid.weebly.com/uploads/1/3/0/9/130969826/f2870a34aa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC9 5172 bytes
SHA-256: 2f81405c249a92ceedafd5c72e8b6a32eef98efb1b16e6e39b0793a47980c677
font_01_sfnt_off0000ee85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE85 10608 bytes
SHA-256: 737a87787f521fe0a346b906c6c09edc9084685a002a9b69e90fba22af703f6a