Malicious PDF — malware analysis report

Static analysis result for SHA-256 a939daecc6d50656…

MALICIOUS

PDF

80.5 KB Created: 2021-03-16 05:59:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bd5631b6d14c6df7a3635d918d9c53a6 SHA-1: 91d748e22c28e78c04827fb02a8792370e5c83ff SHA-256: a939daecc6d506569e3d726c4747bcf90fe10aa8e009b115e81873f155ab8eb8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it is designed to redirect users to malicious sites, likely to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://xezojetit.ru/award?keyword=stanley+trumpet+voluntary+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382773/normal_6047863a298d4.pdfIn PDF document text
    • http://english-10.site/is_shell_scripting_easy_to_learnp4dur.pdfIn PDF document text
    • http://tryici.xyz/how_much_is_mike_kennedy_worthtolm9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482847/normal_601ee8a60c03e.pdfIn PDF document text
    • http://skidki-day.store/82272924678sr7nt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486772/normal_5fee3a49ba2ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453098/normal_60122649c027e.pdfIn PDF document text
    • http://fomigiv.mypressonline.com/everlasting_god_piano_chords_william_murphy.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvuwoki/dNjarid/my_boy_free_gba_emulator_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/nilimijano/ghCGH9G/crossword_puzzle_maker_edhelper.pdfIn PDF document text
    • http://foodguideblog.com/most_common_genetic_disorders_in_humans8hh1d.pdfIn PDF document text
    • http://wefilevazobakeb.mypressonline.com/allman_brothers_jessica_sheet_music.pdfIn PDF document text
    • http://stopnutristrike.ru/69687017826gjga8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417318/normal_602e7da129589.pdfIn PDF document text
    • https://cdn.sqhk.co/rajunakeb/Xjd8iaS/pizunukemal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467043/normal_603860e76a82b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383915/normal_602766e2743d8.pdfIn PDF document text
    • https://cdn.sqhk.co/bamewimoxatu/vgZAXhg/5850559986.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://newigumumakewi.epizy.com/jaxekolisad.pdfIn PDF document text
    • http://jefepar.rf.gd/ganozuwezulopexazopikibo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE526 5272 bytes
SHA-256: b6030c55994bfee2a76a89e1a3455c048388ad24936c7b2263fbf5ff26175dd7
font_01_sfnt_off0000f712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF712 11540 bytes
SHA-256: 4bd90a37229845b0eac72a8a260952d9d0813ab054736d412a271fabcd6be272
font_02_sfnt_off00011ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED5 16184 bytes
SHA-256: 2e0ba24c2d525d7ed79cf712baa4eeb840960fd09d74dc9047e4d86afbd2b5aa

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