Malicious PDF — malware analysis report

Static analysis result for SHA-256 58d20e21d25f18d9…

MALICIOUS

PDF

70.5 KB Created: 2021-02-24 10:43:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 77c0802e9899bc64b49bf5c4faa5f483 SHA-1: bb1f3659a083f1e6cc53257dd1b4d55409d52738 SHA-256: 58d20e21d25f18d9c51aa7c7d6a1930e2aa7449ac1ac1ec15e5fb84c25e42cf9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://baarspo.ru/strik?utm_term=the+soul+of+money+lynne+twist+quotes PDF link annotation
    • https://cdn.sqhk.co/detaludolef/d35Lghe/bloons_td_5_moab_strategy.pdfIn PDF document text
    • http://xewuxufulizifu.22web.org/mezokumalile.pdfIn PDF document text
    • https://cdn.sqhk.co/pixorikibam/jajcVyd/rapunzel_movie_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nobajoxeruxepin.rf.gd/brush_watercolor_free.pdfIn PDF document text
    • http://vofaxov.epizy.com/pelor.pdfIn PDF document text
    • http://pamilov.epizy.com/59030586956.pdfIn PDF document text
    • http://zakifatuvosi.rf.gd/37134391596.pdfIn PDF document text
    • http://likefiradoweze.rf.gd/belinda_blinked.pdfIn PDF document text
    • http://ninukak.epizy.com/home_dream_level_74_answers.pdfIn PDF document text
    • http://pidukegub.epizy.com/tafebaduv.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98C 4972 bytes
SHA-256: b57ee36659c9c202796aacc353e77352554e85d66f3b8002c50130ee3e2f7aa1
font_01_sfnt_off0000ea72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA72 9728 bytes
SHA-256: 1ee2ec53c00cfeda9ee907fb058a74301f38b7b62358d77964f5e6645c28049e