Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4237138ebfee4e6…

MALICIOUS

PDF

78.8 KB Created: 2021-02-20 22:47:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6ba91bfd40a6fc73327de44273c43795 SHA-1: 995838acd9c1a56e7e49fe56af4476cd37f36bb3 SHA-256: b4237138ebfee4e65225805866e48d9bb12a26d1659000c1a8b606886b0625fb
186 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 high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://leonvi.ru/wix?keyword=the+amazing+spiderman+2+apk+rexdl', appears to be a lure for potentially unwanted software. No scripts were extracted, but the PDF structure and numerous external links point towards a phishing or malware distribution attempt.

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/wix?keyword=the+amazing+spiderman+2+apk+rexdl PDF link annotation
    • http://rifikelatukuw.iblogger.org/1088002040.pdfIn PDF document text
    • https://jimilosebot.weebly.com/uploads/1/3/4/0/134096588/kaxezakubad.pdfIn PDF document text
    • https://wenojobopowegit.weebly.com/uploads/1/3/4/8/134879608/92a8f45.pdfIn PDF document text
    • http://damvglaz2.xyz/jomoxutuzojosufofatekezqeeyv.pdfIn PDF document text
    • https://denijebif.weebly.com/uploads/1/3/4/5/134584122/844aa076.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419001/normal_5fceda5fe6f3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488116/normal_602243b256d1e.pdfIn PDF document text
    • https://xufefizomuziz.weebly.com/uploads/1/3/5/3/135346589/nowujolu.pdfIn PDF document text
    • https://zejosawazir.weebly.com/uploads/1/3/1/8/131856185/52fd9feed869.pdfIn PDF document text
    • http://sluzhba1.net/jump_rope_classes_melbournevov3p.pdfIn PDF document text
    • https://zegoliro.weebly.com/uploads/1/3/2/3/132303320/edef5784792.pdfIn PDF document text
    • https://fuxiwuzepideka.weebly.com/uploads/1/3/1/3/131381491/wuniwumaresove.pdfIn PDF document text
    • http://bcpzonasegur4viabcp.com/yahoo_email_folderhq0md.pdfIn PDF document text
    • http://helper-badges.com/pitutaho8hh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rirusivinudi.rf.gd/b._ed_online_form_2018_mp.pdfIn PDF document text
    • http://zilelinib.rf.gd/sutizemoza.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC6 2952 bytes
SHA-256: d8b907802410e675ceca2784509e58a9dae2947c1b2ad43e3e0c02687eabed47
font_01_sfnt_off0000f654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF654 5636 bytes
SHA-256: 959803e492b57d5df625ba69bdda2386dd55c7c81ed295c3741582af29320065
font_02_sfnt_off0001095f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095F 10476 bytes
SHA-256: 077f97fa0dbf8531a6f83a59a9ba5711238fcb90e87e17a3dd6d05327f881856

Open this report in the interactive analyzer, or submit your own file for analysis.