Malicious PDF — malware analysis report

Static analysis result for SHA-256 12667af00a100c10…

MALICIOUS

PDF

83.0 KB Created: 2021-03-09 12:51:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2b0060b40d7c1573f85c151a075f5ce7 SHA-1: b7b95b4d760ea15997edadd53dd8f5c1d17a680e SHA-256: 12667af00a100c1022ff3e0ff9fbe69281b5341f37c699282e5e323973c380e9
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs pointing to other PDF documents hosted on various domains, some of which appear to be disposable. The primary purpose seems to be SEO manipulation or distributing further malicious content, rather than direct user interaction within the document itself. No scripts were extracted, but the extensive use of external links suggests a distribution or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/award?keyword=causas+de+adenitis+mesenterica+en+ni%25C3%25B1os+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377656/normal_601e11e733282.pdfIn PDF document text
    • https://xirovule.weebly.com/uploads/1/3/4/7/134749068/fotiwixikezu.pdfIn PDF document text
    • https://rilokudewagozem.weebly.com/uploads/1/3/4/5/134597993/3910084.pdfIn PDF document text
    • http://xefemile.22web.org/speed_queen_washing_machine_sizes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389830/normal_601952643dd1a.pdfIn PDF document text
    • https://regivuno.weebly.com/uploads/1/3/1/0/131070843/3fc41202b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369632/normal_5fc7e2a1c05b3.pdfIn PDF document text
    • https://jokasagumejede.weebly.com/uploads/1/3/1/0/131070006/39d550e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368506/normal_5ffa1dc3163b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469103/normal_602469042e4a5.pdfIn PDF document text
    • https://diveziriluro.weebly.com/uploads/1/3/4/4/134447321/059d71249ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412151/normal_5ff8fd1a8378c.pdfIn PDF document text
    • https://xedasijaw.weebly.com/uploads/1/3/1/4/131453620/vewolekez_gomili.pdfIn PDF document text
    • https://tebivozov.weebly.com/uploads/1/3/2/7/132740763/c0e455f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445129/normal_6010201fbe591.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/5d17cc9e-1925-46ce-90bd-1857fc18a1f2/graco_snugride_30_manual_espaol.pdfIn PDF document text
    • http://tevomare.rf.gd/6665579677.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d9463a1-190e-42bd-915c-8174a0bcb15e/how_to_negotiate_a_contract_position.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_off00010600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10600 5388 bytes
SHA-256: f7577f909c18cedf06fcde77dac81359d664425ca877b9f1db7bc06ef5112fb2
font_01_sfnt_off000117f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F6 11308 bytes
SHA-256: 59383bc95a5b6053f0e55474453a0cb32d547142cd1bfafc16f88c6361977c22

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