Malicious PDF — malware analysis report

Static analysis result for SHA-256 27dc64ed15f10fa2…

MALICIOUS

PDF

85.0 KB Created: 2021-03-12 14:06:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f76b15f21352269ae96dc5746838616c SHA-1: 52efafd279791149be7401c96990ed1e05dfe523 SHA-256: 27dc64ed15f10fa23b8587878cd8ae115cfa07a1a46ba5dcaf675785dedee9de
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, with one pointing to a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to appear as a document, further supporting a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/award?keyword=entrepreneur+usa+magazine+pdf PDF link annotation
    • https://cdn.sqhk.co/xonepogafix/gfDgiIs/mesodugomopozuvozikevuxum.pdfIn PDF document text
    • http://ziwusis.getenjoyment.net/what_is_gonga.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/l3gfogc/dikopidelixi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447079/normal_601bca994c1e8.pdfIn PDF document text
    • https://cdn.sqhk.co/tirazirevemu/ihWgcih/73275475250.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481515/normal_5fc95ca87af79.pdfIn PDF document text
    • http://zegiwire.sportsontheweb.net/the_lottery_book_review.pdfIn PDF document text
    • http://tafugegajotu.mygamesonline.org/linear_and_nonlinear_functions_worksheet.pdfIn PDF document text
    • http://pagavopalubutu.scienceontheweb.net/gakisilesazofeguwanovav.pdfIn PDF document text
    • https://cdn.sqhk.co/zetoreli/ggijij6/strikers_1945_2_rom.pdfIn PDF document text
    • http://botanilix.mygamesonline.org/52288964772.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386609/normal_5fdd49034895b.pdfIn PDF document text
    • https://cdn.sqhk.co/jevamivuvugi/iimiduy/pop_star_dress_up.pdfIn PDF document text
    • https://cdn.sqhk.co/wifilivemij/jejdcib/71461317394.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369796/normal_5fe468ac59cde.pdfIn PDF document text
    • http://gadetebes.sportsontheweb.net/circular_a_110_uniform_administrative_requirements.pdfIn PDF document text
    • https://cdn.sqhk.co/gelowidabik/JNiaicY/lofedufowevupad.pdfIn PDF document text
    • http://relodifalixogo.scienceontheweb.net/6816519451.pdfIn PDF document text
    • http://miribut.mywebcommunity.org/laroseze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380890/normal_60359de2910d4.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/hiPzXid/losiberigekipolipoka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fojakosi.atwebpages.com/hp_elite_8200_motherboard_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/vepubewufoduvinas.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/runimomixoxewimafipuguf.pdfIn PDF document text
    • http://bagugexasorip.myartsonline.com/vimosofoximunugot.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/ninja_blender_replacement_parts_bl770.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/this_is_amazing_grace_chords_guitar.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_off0000fab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB6 5336 bytes
SHA-256: 6c4beca999500aaaa4e611a0db0ca627d9bef1f8e4a0e3b351d366f841ed10d9
font_01_sfnt_off00010cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD5 10516 bytes
SHA-256: 829b64635c5288b5a81ab6ab5b1a1181f2374203062e0f2f29e068980010ed0e
font_02_sfnt_off00013102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13102 16060 bytes
SHA-256: 84d5bd19c210eb3b73ecc14096ab1e56fdfb5b80ce7ba4f0052c67c0c2b02727