Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f02bef61c941b34…

MALICIOUS

PDF

77.0 KB Created: 2021-03-07 03:33:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1cc9e076730fac2dc405619f2cbeaa81 SHA-1: 5f7ddf8b86c5f7563eaec5432762a7602fa95b95 SHA-256: 1f02bef61c941b346c6419429e2d1e202180e52e951a500c2bad996c5e226f37
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a large number of external links, suggesting a link farm or redirection mechanism to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to search queries, directing users to external URLs like 'https://golowaki.ru/strik?utm_term=how+to+reset+toshiba+regza+tv+without+remote'. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://golowaki.ru/strik?utm_term=how+to+reset+toshiba+regza+tv+without+remote PDF link annotation
    • https://cdn.sqhk.co/bimolixumotu/fgcajfA/diy_rustic_headboard_ideas.pdfIn PDF document text
    • https://lilafigofuku.weebly.com/uploads/1/3/1/3/131398347/vagex-wotux.pdfIn PDF document text
    • https://nudabixe.weebly.com/uploads/1/3/4/5/134505388/7824887.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448126/normal_5fd89084d66ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387244/normal_5fd1363271b5b.pdfIn PDF document text
    • https://cdn.sqhk.co/kosifodalab/9nw3jgO/febesotikoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488570/normal_60182c81b17fa.pdfIn PDF document text
    • https://werudugin.weebly.com/uploads/1/3/0/8/130873895/6559944.pdfIn PDF document text
    • https://cdn.sqhk.co/sunalikefazo/lZia1ie/42201722869.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/roware/88825056454.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/student_ka_full_form_kya_hota_hai.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/68163635398.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/harvard_classics_shelf_of_fiction.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/vobinuwapexiwoxuwikiwex.pdfIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/zedatevibemomokiluv.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/android_development_offline_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/laxizixino.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/mes_jobs_august_2019_advertisement.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/railway_reservation_form_fillable.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_off0000ef42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF42 5372 bytes
SHA-256: 1f37bfacd4d12b94b513bc1329c9c11c6456fc3c438524b854ec2751a8838e7b
font_01_sfnt_off0001017c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017C 10936 bytes
SHA-256: 013faa2e7dce5f3246564df8d3c11745bb027318cb47366e53b585242e2a9bc4

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