Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e54acaa753a81d1…

MALICIOUS

PDF

72.9 KB Created: 2021-03-05 08:33:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 888d13577e9219c53686ce149de53200 SHA-1: d0c885354e95cfda91f90efea7470d1a157b6c59 SHA-256: 7e54acaa753a81d1656095e30545bf2bfd4af8e9a059686cdea6ffd6eeb9f6dd
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous external URLs pointing to other PDF documents hosted on various domains. The presence of a link farm on disposable hosting suggests an attempt to distribute malicious content or phish users. The document body appears to be corrupted or obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/wb?keyword=marantz%20professional%20pmd-300cp%20dual-cassette%20recorder/player%20with%20usb PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372696/normal_6025985d141d0.pdfIn PDF document text
    • http://lidlid.xyz/fawomixavojuvurz3wn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487186/normal_60082cbca5c4b.pdfIn PDF document text
    • https://cdn.sqhk.co/giwumazusew/4Ro97iP/ktm_1290_super_adventure_2020_model.pdfIn PDF document text
    • https://cdn.sqhk.co/daruluneti/dCSSxet/bumuxipirezuvorej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489853/normal_603fb61e133d1.pdfIn PDF document text
    • https://cdn.sqhk.co/jawefujivi/gggcMig/craigslist_atlanta_for_sale_by_owner_harley_davidson.pdfIn PDF document text
    • http://3bki.ru/zewiwimodifejamujiburio87c0.pdfIn PDF document text
    • https://cdn.sqhk.co/kawurefeki/gOBjIAh/lightroom_classic_update.pdfIn PDF document text
    • http://instahelpforbusiness.com/ieee_reference_format_generatorue9ff.pdfIn PDF document text
    • https://cdn.sqhk.co/tategupet/cfSYd9h/geregivabo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417808/normal_5fdbfd1b6cad2.pdfIn PDF document text
    • https://cdn.sqhk.co/zesozote/jcZAjhs/angry_snake_tattoo.pdfIn PDF document text
    • https://cdn.sqhk.co/kanedufopuma/FOgcYsk/sorilomaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476147/normal_60068e06e3f9a.pdfIn PDF document text
    • http://vataponuxizeliz.mywebcommunity.org/how_many_watts_does_a_5_000_btu_window_air_conditioner_use.pdfIn PDF document text
    • http://santand-es.com/gps_garmin_oregon_600_prix9em55.pdfIn PDF document text
    • https://cdn.sqhk.co/pelopuxi/WlgggdR/kilaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_b8b450ba6db640ecb5465203ce26139d.pdf?index=trueIn PDF document text
    • http://bototiluwoge.atwebpages.com/xojevevadumizagi.pdfIn PDF document text
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_e002e409d4bf4c11953b623afb13bde3.pdf?index=trueIn 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_off0000da8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8C 6160 bytes
SHA-256: ab5a896be3e6b0b0e0b46ee5acd351a0640037bd8cc65fc7374335e2526dcf38
font_01_sfnt_off0000ef8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8D 11188 bytes
SHA-256: 345e4b94e0a90ed2e2eed51db1adcd2ef4c6b0e91feb27e32c4d6015a6e0d43a