Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f80a234dd5b737b…

MALICIOUS

PDF

89.2 KB Created: 2021-02-22 06:12:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c9030ec50c11e0dca2e6bc89ec4ad67e SHA-1: 0ce25842b832a3017cf5e6bdf5acaf09d8ee786f SHA-256: 9f80a234dd5b737bbbf9fffb5a6555b15291165c97a9a4424225f7b308ec0d00
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are hosted on disposable domains or services like Weebly and S3, suggesting a link farm or phishing campaign. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a high volume of outbound links designed to manipulate search engine results or redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly support its malicious nature, likely as a phishing or redirection tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/123?utm_term=how+to+write+an+essay+for+scholarship+money PDF link annotation
    • https://dilukali.weebly.com/uploads/1/3/4/5/134584555/goxivolexibuxe-dufesesefad-zobovuvovew.pdfIn PDF document text
    • https://cdn.sqhk.co/kobewudojuvo/fChhjZW/used_carnival_games_for_sale_canada.pdfIn PDF document text
    • https://sifegofariwe.weebly.com/uploads/1/3/1/4/131437131/bedasomagatos_pitonebidere_kafil.pdfIn PDF document text
    • https://zorutamazu.weebly.com/uploads/1/3/4/0/134096431/062cc.pdfIn PDF document text
    • https://doritader.weebly.com/uploads/1/3/4/8/134885844/3638385.pdfIn PDF document text
    • https://nedamekiwuj.weebly.com/uploads/1/3/1/3/131379605/9931830.pdfIn PDF document text
    • https://susafoxepi.weebly.com/uploads/1/3/0/7/130775374/gogelebiduda.pdfIn PDF document text
    • https://cdn.sqhk.co/nazopekujavi/ijighdz/duruxa.pdfIn PDF document text
    • https://wawanuxofidote.weebly.com/uploads/1/3/0/7/130775818/e6c7682814a9.pdfIn PDF document text
    • https://xisifogobodi.weebly.com/uploads/1/3/4/7/134735845/niwekexowaxu_fotupugef_rezobixizupo.pdfIn PDF document text
    • https://vasinurevesodux.weebly.com/uploads/1/3/4/6/134605286/7603208.pdfIn PDF document text
    • https://roriwemako.weebly.com/uploads/1/3/4/5/134599113/vidoxodo.pdfIn PDF document text
    • https://lalidusuferub.weebly.com/uploads/1/3/4/4/134440540/6c8e066e38.pdfIn PDF document text
    • https://zeleloda.weebly.com/uploads/1/3/0/7/130776222/c9d3408a5.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/lezopobigeza/43516059257.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/bidadari_tak_bersayap_cover_jeje.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/60745510424.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0F 6276 bytes
SHA-256: 53c4d28a2a29563e451e553d66361e1fefd84979e94e391a5d272fa4734415b4
font_01_sfnt_off000113c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C6 5196 bytes
SHA-256: 378ec01204748d8e0171b6decd0851c917ab3e21759e4ea66822ff2671580258
font_02_sfnt_off00012555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12555 10340 bytes
SHA-256: dc146b470c14896414946f9a6c9beb725cfa3cdc4da1b5bac68350fae64ea915
font_03_sfnt_off000148c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148C5 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c