Malicious PDF — malware analysis report

Static analysis result for SHA-256 81db18c339298fb2…

MALICIOUS

PDF

78.8 KB Created: 2021-05-17 06:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 14bf5ec37ebb696f4581a967508bbec1 SHA-1: 2281aa466b538cc0d2be79fbc6ed4d752c000ffd SHA-256: 81db18c339298fb2ff42ed1807b829abfb0bf3c0a36640ab1bd531e09b7bdfcd
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or SEO link farm attack. It contains numerous external links, many pointing to disposable domains or subdomains, suggesting an attempt to distribute malicious content or manipulate search engine results. The presence of embedded URLs and the overall structure strongly indicate a malicious intent to redirect users to potentially harmful sites.

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://midufefew.ru/strik?utm_term=what+size+belt+does+a+john+deere+l110 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404529/normal_5ffec3d0ecab4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454051/normal_5ff926916eba8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488329/normal_603e2f5433401.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366042/normal_6021a91817f74.pdfIn PDF document text
    • https://cdn.sqhk.co/dubibuwa/jeKhgV9/remove_fill_color_illustrator.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379603/normal_5ff2103b9092b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454973/normal_5fd1e2b3ac6fc.pdfIn PDF document text
    • https://cdn.sqhk.co/nupasoxure/q0egfie/335931473.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415045/normal_602c2d790eac7.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/ieidcja/garafomixadujolaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502817/normal_602cf7754464a.pdfIn PDF document text
    • https://cdn.sqhk.co/revowemerem/I2jiNjb/how_to_change_zelle_phone_number_citi.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
    • https://s3.amazonaws.com/xijalovelokolep/jituwozokirujepiloninad.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/mavixemepifaxofowumeg.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/99737611943.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/delta_bilirubin_formation.pdfIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_dcdc62885b61493bb44df473ab12a4a2.pdf?index=trueIn PDF document text
    • https://466f9527-ada3-48b4-ac0c-4ba5546996ca.filesusr.com/ugd/a4b6b9_d81ae9dc1860489db85d77b5c40793ca.pdf?index=trueIn PDF document text
    • https://1e438cd7-6f3b-42ac-a97b-d13a75fa135b.filesusr.com/ugd/0c268c_5e0bf813b88a4ab6a02f6a8df003ee1e.pdf?index=trueIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_1b9c45605a064c848ef3bf2cf326f2cb.pdf?index=trueIn 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_off0000e80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80F 5172 bytes
SHA-256: 958ea3f03f02d1da64196bf5d42f030aced6bcb8b489fbe8b830fe1405f60b4c
font_01_sfnt_off0000f9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A7 11236 bytes
SHA-256: 164eb1b6ee5f3fff4a63f600bb3ce3f2f650cabbf33cda7e33a593aad9d180f9
font_02_sfnt_off00012008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12008 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333