Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3bd28e2305f993…

MALICIOUS

PDF

91.0 KB Created: 2021-03-14 01:03:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a9bc5ed28103472cfe91348ed6c3b07e SHA-1: b2d90bc27838c3b6e794a924a5cba8136406a35d SHA-256: bf3bd28e2305f99365ab0ea9e6115535d715b8f41fbf314abdbb2f9c841520e8
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains and redirector infrastructure, indicating a link farm for SEO manipulation or malware distribution. ClamAV and ML heuristics confirm its malicious nature, specifically flagging it as a phishing trojan. The embedded URLs are the primary indicators of compromise, suggesting the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=economic+systems+comparison+chart+worksheet+answers In PDF document text
    • https://vevumugenewasu.weebly.com/uploads/1/3/0/7/130776279/ff87765261.pdfIn PDF document text
    • https://cdn.sqhk.co/gowalitusiwa/hkBVj6k/cross_roads_tx.pdfIn PDF document text
    • http://duperalenow.22web.org/resident_evil_5_full_movie_free.pdfIn PDF document text
    • https://lebotisoko.weebly.com/uploads/1/3/4/5/134597635/9ac40c889c.pdfIn PDF document text
    • https://wisiwojapano.weebly.com/uploads/1/3/4/8/134896472/feserimoledan_defizuzav.pdfIn PDF document text
    • https://notilapixoto.weebly.com/uploads/1/3/4/3/134397855/dobekigegi_zofazibun.pdfIn PDF document text
    • https://cdn.sqhk.co/zotofoza/ghhiihz/hovercraft_takedown_hack_apk.pdfIn PDF document text
    • https://kabolonopatine.weebly.com/uploads/1/3/4/2/134265344/fokafiwe.pdfIn PDF document text
    • https://wibipujesotut.weebly.com/uploads/1/3/1/3/131398272/b916524d.pdfIn PDF document text
    • https://cdn.sqhk.co/nupegefozub/hqjghza/nudirebegog.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/s0YDChf/denif.pdfIn PDF document text
    • https://cdn.sqhk.co/juvebuzizej/aienpjj/anagram_solver_scrabble_words_with_friends.pdfIn PDF document text
    • https://wixepivod.weebly.com/uploads/1/3/0/7/130775856/wenevurebizofolerevo.pdfIn PDF document text
    • https://cdn.sqhk.co/fosigigamef/0hcUjbX/4295261985.pdfIn PDF document text
    • https://tinuxapesizagi.weebly.com/uploads/1/3/4/4/134440362/8464912.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/e5daa1a3-bace-4e0f-9ab8-797c08dadbb5/msi_z87-g45_gaming_price.pdfIn PDF document text
    • http://pasalalu.rf.gd/momuwifitonisujaseb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2028255c-e213-4322-b6c8-d487f572b98f/pafijobe.pdfIn PDF document text
    • http://taregedekuxugux.rf.gd/50112076562.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d894e8c-7c90-4c5e-8dc1-4267af9c78ad/lean_startup_book_eric_ries.pdfIn PDF document text
    • http://fanofajuduma.rf.gd/34153006719.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/003b6d4e-e584-4901-95bf-3e5c5aa16a81/ap_stylebook_oxford_comma.pdfIn PDF document text
    • http://wexewowi.rf.gd/49130368776.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4081187b-56b3-497b-9833-0e5bdb4d2e8e/77490566003.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_off00011688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11688 4272 bytes
SHA-256: 8cd3ef3474e5f62a449901d0e5c3a219c2cba88975ae427c1703b014f81e200e
font_01_sfnt_off000125a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A4 5356 bytes
SHA-256: 3e98ae1eab057911a8f5a04cb64e66cae2f2423a8a30685f017d3a21bfd2523e
font_02_sfnt_off000137cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CC 11284 bytes
SHA-256: 6fb48ad702969df0609e7f67aecec56ef9b79759b539849697c42a54775c1dc1