Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bceb74da2b9d57f…

MALICIOUS

PDF

85.0 KB Created: 2021-02-26 10:33:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: e0f4b08bd07ad4a1a542fc628a660391 SHA-1: 86cba7ae3fd455b327b1a0128e64da1ae4e707c2 SHA-256: 8bceb74da2b9d57fb541acaf1c80fafcf999c2ee8e272ff07b13fb484e42023e
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a phishing or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://jacksth.ru/award?keyword=western+digital+my+cloud+ex4100+setup PDF link annotation
    • https://novadoja.weebly.com/uploads/1/3/4/8/134873208/735228.pdfIn PDF document text
    • https://rimofunoduw.weebly.com/uploads/1/3/4/5/134525219/nexezijinot-motesigipaxum-tedurekugep-kifukom.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutowede/AXyciiK/adorable_home_game_bedroom_design_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/tavanaru/ijbSjSC/mike_marshall_marshall_hotels.pdfIn PDF document text
    • http://kafologegodudo.iblogger.org/63523859557.pdfIn PDF document text
    • https://kilekawu.weebly.com/uploads/1/3/4/8/134857711/9883512.pdfIn PDF document text
    • https://cdn.sqhk.co/furugilenu/01nidjh/printable_blank_map_of_uk_counties.pdfIn PDF document text
    • http://fazoluniguket.iblogger.org/10068537957.pdfIn PDF document text
    • https://cdn.sqhk.co/meduxemij/wEgcP5v/pelujekimuxipigamegawul.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mimegovo.epizy.com/roblox_lumber_tycoon_2_btools.pdfIn PDF document text
    • https://s3.amazonaws.com/dofufiri/breakdown_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/pazikorir.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/45935731481.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/41525144030.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/gagudunekigedunademurutej.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/nojuxunapawukevu.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/16953826845.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/kiretilabapod.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/acana_large_breed_puppy_food_feeding_guide.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_off0000f93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93A 1724 bytes
SHA-256: d2d65a8b04c555ff691869507fe63aecb975aafdb4ac6af5e2f016a013b6e4a3
font_01_sfnt_off000101c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C6 5860 bytes
SHA-256: 865bac738626ad1efc8a4ee21f9635752ab62cc8cbac1a26a125c65be3c1a069
font_02_sfnt_off000115c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C6 15740 bytes
SHA-256: 1d7bc881ecd6fab9797f9358a2efc8028669480750ee806b9a466f9f7ef2bec1

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