Malicious PDF — malware analysis report

Static analysis result for SHA-256 1971d535c888ff3f…

MALICIOUS

PDF

63.9 KB Created: 2021-02-18 05:42:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 4cbfc903e7786f003a32fcc8a7432f0c SHA-1: 5cfa52a4f36ceaa8d4b35372437bccfb03f2f1cd SHA-256: 1971d535c888ff3f2d470c1fd4edf36321d2141c1e815799c9702c7eff8d3fe3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, with the links likely serving as a lure for phishing or SEO manipulation. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://leonvi.ru/strik?utm_term=polk+omni+sb1+plus+reset PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375339/normal_5fe2bcc36950f.pdfIn PDF document text
    • https://tijagure.weebly.com/uploads/1/3/1/3/131398232/bogixogivopa-bidubopalis.pdfIn PDF document text
    • https://cdn.sqhk.co/mewivupa/cyXihaQ/fitevazutazugu.pdfIn PDF document text
    • https://nogalagamepet.weebly.com/uploads/1/3/0/7/130738620/sosasatatu-faxovaporexexap-mukowodan-wozolo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374376/normal_602922a13fe4b.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/c9hjCii/nodezekuwedopikufuvisojiv.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/4TpOgiP/44202383855.pdfIn PDF document text
    • https://cdn.sqhk.co/kevapaboxer/bxMUxhj/wunuwukejafa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458413/normal_5ff274f394c0f.pdfIn PDF document text
    • https://cdn.sqhk.co/posuwumujome/eigHVha/bajatulemokiv.pdfIn PDF document text
    • https://wikefazopikevi.weebly.com/uploads/1/3/4/7/134715570/tubogejijuvimi.pdfIn PDF document text
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/9f483ba626bff15.pdfIn PDF document text
    • https://tozovugoji.weebly.com/uploads/1/3/1/6/131606343/tenemumibukasi.pdfIn PDF document text
    • http://zegofivuwirukon.22web.org/define_acquisition.pdfIn PDF document text
    • http://bobejitamatu.iblogger.org/aspiring_minds_questions_and_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kenavegolixase.epizy.com/atipia_linfocitaria.pdfIn PDF document text
    • http://nupuzasig.epizy.com/basement_car_park_design_guide.pdfIn PDF document text
    • http://vevojadiren.epizy.com/hays_australia_timesheet.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_off0000bf29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF29 5012 bytes
SHA-256: 866293dc4d829fe50f8b8ea99f60a20b3eb4cb5d180dc19952f323ca0176a705
font_01_sfnt_off0000d029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD029 10040 bytes
SHA-256: c090b2230d2a5c28400605f3d8dabb1ac31cf4589dd3d55621caf4a46a4d5b63

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