Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc9413304cc09d44…

MALICIOUS

PDF

78.6 KB Created: 2021-03-03 17:43:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 88cdd7f0c3d7eb2b3507343572c929e5 SHA-1: 4fd327ae4810798a5cec467d1e4f670c7594cba9 SHA-256: cc9413304cc09d44d5af8363adf9805ca4cbd8335e4fe7ed870b2a567189fbf7
186 Risk Score

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, indicative of a link farm. ClamAV and ML classifiers identified this as malicious, specifically a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=why+is+legislative+history+important PDF link annotation
    • http://bigpleasure.ru/81770006627apk6q.pdfIn PDF document text
    • https://zorivaleguzovul.weebly.com/uploads/1/3/4/5/134596353/kozabi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452157/normal_601d758a6d738.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392463/normal_5fcb16f5d07fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457318/normal_602744740be15.pdfIn PDF document text
    • https://cdn.sqhk.co/fosulavale/hic1hju/miwolubesekegatulifajimog.pdfIn PDF document text
    • https://rigavimiba.weebly.com/uploads/1/3/0/8/130814992/bajuxipokofatu.pdfIn PDF document text
    • http://am-sound.ru/magic_tile_piano_tiles_onlinexvsfd.pdfIn PDF document text
    • http://hotsales-com.xyz/rurudeboduff8t2q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393908/normal_60255dc2ac124.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389097/normal_600907a6d1faf.pdfIn PDF document text
    • https://wugowimuvup.weebly.com/uploads/1/3/4/7/134762233/foxavisiwuvar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375907/normal_5fe9c3e708c21.pdfIn PDF document text
    • https://cdn.sqhk.co/panafilaputu/fklSgdI/parent_plus_loan_deferment_covid.pdfIn PDF document text
    • https://jasebezaf.weebly.com/uploads/1/3/4/6/134630561/4cb0dddb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382405/normal_60327f4aa646c.pdfIn PDF document text
    • https://cdn.sqhk.co/dediwifime/vnFO0ic/barrett_jackson_auction_schedule_2021.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/pukaridimupo/cia_training_facility_the_hill.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_off0000f418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF418 5408 bytes
SHA-256: c20271dd44f14263c91d35ee1a85d05757ea12f006718de4861c1e4b573c609c
font_01_sfnt_off00010669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10669 11088 bytes
SHA-256: a54dd81852a3b90e0181a29d6d7f3767d1d900150088cf44cfc1f9a04c6c6635

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