Malicious PDF — malware analysis report

Static analysis result for SHA-256 545fa9b78847b72e…

MALICIOUS

PDF

68.5 KB Created: 2021-02-22 16:59:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: f397fc01c92d5af3ee3fb5289f6f6f39 SHA-1: d4e24e27f62a836eb8e020ea89e49f22c5285de2 SHA-256: 545fa9b78847b72e39f40c6db3199611fbd2de97c7839abc3020977a7ad2efb5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an attempt to redirect the user to malicious or deceptive content.

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://bologen.ru/strik?utm_term=bully+dog+gt+tuner+dash+mount PDF link annotation
    • https://cdn.sqhk.co/wakivugex/jgf2kib/97698706069.pdfIn PDF document text
    • https://balejumefem.weebly.com/uploads/1/3/0/8/130814467/mozotenet_mawiguxuxo_retabovoxaxeko_najuv.pdfIn PDF document text
    • https://nowitapa.weebly.com/uploads/1/3/1/4/131438176/68c08a88b4d806c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460449/normal_6032f1aaee42b.pdfIn PDF document text
    • https://woxarupuxanuma.weebly.com/uploads/1/3/1/3/131383908/viladu.pdfIn PDF document text
    • https://taxefijiduru.weebly.com/uploads/1/3/5/3/135311915/36845024b6b01.pdfIn PDF document text
    • https://xenewonunawof.weebly.com/uploads/1/3/2/7/132740417/gexirufi.pdfIn PDF document text
    • https://zibaxewax.weebly.com/uploads/1/3/4/6/134699960/b5c1c658.pdfIn PDF document text
    • https://mitumeme.weebly.com/uploads/1/3/4/8/134879381/nirawezeraxadabobis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425209/normal_600cfa3a187d7.pdfIn PDF document text
    • https://diriremipujuna.weebly.com/uploads/1/3/4/2/134265666/07e6b61.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/dedinavesute/room_rental_agreement_template.pdfIn PDF document text
    • http://davivozerab.rf.gd/how_to_self_install_optimum_modem.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/13523960399.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/ceecoach_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/overview_electromagnetic_waves_worksheet.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_off0000ceab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAB 5388 bytes
SHA-256: ff1a9187ecc5b46207bcfc759353e86dda3a1d0faa071d398a64cf9c93c28063
font_01_sfnt_off0000e0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DF 10220 bytes
SHA-256: 9e10b392915dec76b2b6f50b431edb6b55c79490e5c437186140be8b1487c8c5

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