Malicious PDF — malware analysis report

Static analysis result for SHA-256 f14c81fb35eb1ed4…

MALICIOUS

PDF

72.6 KB Created: 2021-01-10 08:27:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: bb9e5121e2abf6119b1d62aacdcaf34c SHA-1: 77ed1007b07a30cb25756a117df3b991354d23d9 SHA-256: f14c81fb35eb1ed4d8a6032d81c1ca2633f6480bb830f2d1bf464ca251b872a9
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristics point towards an attempt to exploit users by directing them to potentially harmful 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://trafficel.ru/123?utm_term=santa+monica+bay+chess+club PDF link annotation
    • https://cdn.sqhk.co/zupuguvawaj/29hhgi5/maps_for_mcpe_0._15_0.pdfIn PDF document text
    • https://miwofovewunot.weebly.com/uploads/1/3/4/8/134873206/lunimefubukani_widirovat_vowofodiso.pdfIn PDF document text
    • https://cdn.sqhk.co/besawevij/aiirjaA/amazon_store_card_synchrony_bank_customer_service.pdfIn PDF document text
    • https://rofasaxoropop.weebly.com/uploads/1/3/5/3/135316675/rubokoraju-vunur.pdfIn PDF document text
    • https://cdn.sqhk.co/tubafejog/9jc2iac/nipinapajopirixafoxuz.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/bvjdLn9/getty_images_login.pdfIn PDF document text
    • https://kujibolivobukib.weebly.com/uploads/1/3/1/1/131163991/tagobazo.pdfIn PDF document text
    • https://finolija.weebly.com/uploads/1/3/4/6/134625313/visinawiviwiwebez.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/ZjfxNMi/sujiw.pdfIn PDF document text
    • https://site-1195159.mozfiles.com/files/1195159/64020738002.pdfIn PDF document text
    • https://vurofagulomefu.weebly.com/uploads/1/3/1/4/131452840/favab-wadudotef-nagizunoku.pdfIn PDF document text
    • https://cdn.sqhk.co/sukijubese/kgdVcvV/wuzibipojinovifawib.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/vinivuxo/woodland_formal_shoes_brown.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_off0000de72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE72 5288 bytes
SHA-256: 8b3afed5551cfed06ef5fbaf0e650d392351490bd8f5ac8cc4679074904da2af
font_01_sfnt_off0000f04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04F 11212 bytes
SHA-256: 2f30763062f3f49280e203c677fb3646411f61942ab72f288ce5e9090bf9c803

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