Malicious PDF — malware analysis report

Static analysis result for SHA-256 97481f178d222095…

MALICIOUS

PDF

91.0 KB Created: 2021-05-27 14:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 0641710ce2d1617fd029b987ac0203c9 SHA-1: cc51dab51057d882a4f403961754f8bbfe99df85 SHA-256: 97481f178d22209532b95d8491cec400ec664b6e7ea4bb9ffad2f856a8a1f71b
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, with one prominent URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/strik?utm_term=origin+of+cultism+in+nigeria+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388169/normal_604e5a3e843dc.pdfIn PDF document text
    • https://fefojaza.weebly.com/uploads/1/3/4/4/134480993/rurufu_kowadi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475203/normal_6063fab700f2c.pdfIn PDF document text
    • https://diwopoko.weebly.com/uploads/1/3/4/5/134597367/9297a583.pdfIn PDF document text
    • https://vujebitaj.weebly.com/uploads/1/3/4/7/134759162/poxutexojov-biparagugomobi-vosazinekebate-vofaguvose.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480745/normal_602df9f8e05b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417212/normal_6068ae1423128.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449771/normal_60418d510fa0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453754/normal_5fdacc20c32cd.pdfIn PDF document text
    • https://diwopoko.weebly.com/uploads/1/3/4/5/134597367/vedotalibejafe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485301/normal_6048de7d29326.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365549/normal_605a80ede2a90.pdfIn PDF document text
    • https://dujejasafat.weebly.com/uploads/1/3/0/7/130739214/livigonogofuvo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451753/normal_5fdba16db98ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481676/normal_606b7620cd75a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488572/normal_5fd2dd9bd4671.pdfIn PDF document text
    • https://pupizotewijuguw.weebly.com/uploads/1/3/0/7/130775862/a41106d0f760.pdfIn PDF document text
    • https://waluxine.weebly.com/uploads/1/3/4/7/134759732/wibip_pugojutu_gulijovute.pdfIn PDF document text
    • https://sewimumox.weebly.com/uploads/1/3/4/6/134668968/7442072.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/08c51b28-06e0-44ec-bbab-56e3b21f5334/24247921318.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80d15b1c-e09b-4ae4-91d5-3731d2ad21fd/niremo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70b60053-3cee-4253-b994-a9d10290e1e9/what_is_the_power_to_read_minds_called.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_off00012868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12868 5504 bytes
SHA-256: c872b3e16cd4372903e062f711a435d8d86f844a1a47239745b2c4a75870ee85
font_01_sfnt_off00013b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0D 10560 bytes
SHA-256: 1b0a70a63d9b83da740020e8f2130e39727b2664c5703c62d4acd7cb6dd9d842