Malicious PDF — malware analysis report

Static analysis result for SHA-256 566130a6594233dc…

MALICIOUS

PDF

77.1 KB Created: 2021-06-09 11:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f1f8c00e1b94732690400553d6d6add4 SHA-1: 3e7262e77aa7a2b7a7362fef718c89bd6001aeeb SHA-256: 566130a6594233dcd0fd56cf0678b20a7632ef1f29b85c6d5d5aa38e1bb5a558
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The primary URL observed is https://crysiq.ru/pbw?utm_term=fire+red+u+rom, which is likely part of the lure. No scripts were extracted, but the structure and URL patterns strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://crysiq.ru/pbw?utm_term=fire+red+u+rom PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382948/normal_5ff77ff7c8ba0.pdfIn PDF document text
    • https://kuvolobogon.weebly.com/uploads/1/3/4/0/134012650/e22a94270f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423442/normal_603d0b57d7602.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391302/normal_5ffd3ade61ad6.pdfIn PDF document text
    • https://juwopivevonu.weebly.com/uploads/1/3/4/6/134682880/7874369.pdfIn PDF document text
    • https://metenesepagozo.weebly.com/uploads/1/3/4/7/134710396/kazexa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461205/normal_5ff54b33e3770.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458132/normal_606058c693220.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410217/normal_5ffd3f40ee058.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484812/normal_5fd0903949c17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417648/normal_5fd96aa65a956.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380707/normal_5fefdd28726f1.pdfIn PDF document text
    • https://tibirodemoxojuf.weebly.com/uploads/1/3/4/3/134336787/eff397f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369926/normal_60203615e385e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424982/normal_60554ba399776.pdfIn PDF document text
    • https://wamogipoko.weebly.com/uploads/1/3/0/7/130739383/kazemiz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470040/normal_5ff8496c7b862.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393632/normal_6064bf115d72a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385869/normal_606373614a948.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388427/normal_6011320010d08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389570/normal_600b454fa7637.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380522/normal_6021273af1b56.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://najajadux.pbworks.com/f/xotuniwow.pdfIn PDF document text
    • http://dipazuwawex.pbworks.com/f/79670267681.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_off0000e592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE592 4204 bytes
SHA-256: e970f4660cc6408efa80867e31a2d53793d3398558118158859bd76f23281c24
font_01_sfnt_off0000f3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C5 10972 bytes
SHA-256: 2c4db2969a15eba8bc0d47b3e514b6748cd1fc44296833b8185a593d358c7710
font_02_sfnt_off0001191f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191F 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378