Malicious PDF — malware analysis report

Static analysis result for SHA-256 68b6cd1f0d9d2d37…

MALICIOUS

PDF

120.0 KB Created: 2021-01-06 08:40:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: f739ee84f7399773ad419b1f598b5d63 SHA-1: 27c600ff9e4346d81d2e2f3cba083b0751b5c1d4 SHA-256: 68b6cd1f0d9d2d37fcdd394ec4d0b1caf72be31b45b0964556fad5d7a0800067
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of a large number of external links, with the primary one being https://trafffe.ru/aws?utm_term=qualitative+systematic+review+guidelines. This suggests the document's purpose is to redirect users to a network of potentially malicious websites, possibly for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://trafffe.ru/aws?utm_term=qualitative+systematic+review+guidelines PDF link annotation
    • https://turikiripejuz.weebly.com/uploads/1/3/4/5/134501804/lemivujot_bijuvajatajib_sodagonamumo.pdfIn PDF document text
    • https://muzezibabut.weebly.com/uploads/1/3/0/7/130739211/beb3175aa018fe0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416928/normal_5fa6e85ae8b85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468827/normal_5fbbc4c43c2bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481695/normal_5fb266b9cbb32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388613/normal_5faa63e511d3c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454047/normal_5ff47c8e5d9b0.pdfIn PDF document text
    • https://lokixesope.weebly.com/uploads/1/3/1/6/131607163/f5e41d7eea77a4.pdfIn PDF document text
    • https://cdn.sqhk.co/regavebike/rjai5Pl/facebook_marketplace_app_not_working.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423428/normal_5fe993f1e6000.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/fKBVjah/xifabirabivonive.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_off00019919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19919 5572 bytes
SHA-256: 93bfa9d1e2dfb7f64db098e70837b83a7bf60aa00b618c0c0d61e6f0047fd34a
font_01_sfnt_off0001ac14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC14 11740 bytes
SHA-256: 608c763400f24418d639086382f15deebe59920349b370a1a88521fba80950ca

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