Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b3791dd0664a0fa…

MALICIOUS

PDF

86.9 KB Created: 2020-11-18 17:25:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0816cc51a3f795a9dbca05ab44ce2ac9 SHA-1: 9b716760c24800e3fdb29529d5522f75131636fa SHA-256: 6b3791dd0664a0fa36df1a4506c874cc4aa7cae758c4befde9ba2db883d777a6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafftec.ru/123?utm_term=resident+evil+outbreak+file+2+cheats PDF link annotation
    • https://zuvopejibi.weebly.com/uploads/1/3/4/0/134017525/mutojo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387033/normal_5fab8c87c9e9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379603/normal_5f9a65ff7cf76.pdfIn PDF document text
    • https://juvuxoxeziw.weebly.com/uploads/1/3/4/3/134313380/xibobepuwo-kodesamogewutir-fizusawozam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369185/normal_5f8b343a5e4f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473445/normal_5fa83db1ba108.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366364/normal_5f8e405e886f2.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/3670904.pdfIn PDF document text
    • https://loxigiberojawi.weebly.com/uploads/1/3/4/7/134770663/wisojub.pdfIn PDF document text
    • https://saniwuladekogek.weebly.com/uploads/1/3/4/7/134759819/rugufagaxutuwi_raxobiwu_vafowigalam.pdfIn PDF document text
    • https://vupubajuxik.weebly.com/uploads/1/3/4/4/134492473/temodiwarixedexenizo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482625/normal_5fb2c41a86a9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404755/normal_5faf991f3e652.pdfIn PDF document text
    • https://pivozedotafi.weebly.com/uploads/1/3/1/0/131070355/1257824.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C1 4516 bytes
SHA-256: f5495b5c6a4f3b1f23a57c6400198e66de13659cac592925b020a655a7a3bb36
font_01_sfnt_off00010856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10856 5392 bytes
SHA-256: f84d4b5cff3c51277ad5ce57a31d26b8e96705afee0a45daebc1908ffec0f5cf
font_02_sfnt_off00011aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAB 10716 bytes
SHA-256: 778d09eb802499ce39cfcf8b91af006af49fb8678dde09b20bb223a3e10ce7b0
font_03_sfnt_off00013f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F74 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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