Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7dac9df6d71aa6…

MALICIOUS

PDF

64.8 KB Created: 2021-02-23 04:07:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5b9aa3a1cc9206a5d1dbe94d0f2bd420 SHA-1: 6b2ff1da65fb15d02211f22f66b93e0c1144e372 SHA-256: 8c7dac9df6d71aa6cb3bbd3352414f0b0a12a7a1ec2728c92864b05645de7bc8
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with several heuristics flagging it as malicious and a redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links to disposable hosting and redirector infrastructure suggests a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=persona+5+artbook In PDF document text
    • http://0fruit.space/34644379251pqckj.pdfIn PDF document text
    • https://cdn.sqhk.co/madumubo/EARxfgc/ear_infection_covid_test.pdfIn PDF document text
    • https://jovigazever.weebly.com/uploads/1/3/1/6/131637362/nexujevovosopufarin.pdfIn PDF document text
    • http://idealica-it.website/2013_dodge_charger_rt_gas_mileage8m0nz.pdfIn PDF document text
    • http://shopbest.online/32363449716kl38c.pdfIn PDF document text
    • http://50offshop.pro/a_whole_new_world_chords6al98.pdfIn PDF document text
    • https://cdn.sqhk.co/migukosodaza/e6gcgig/paroz.pdfIn PDF document text
    • http://teenagetutor.online/mhw_all_campssdg80.pdfIn PDF document text
    • http://ourfutures.space/tu_mano_me_sostiene_letrag6rqt.pdfIn PDF document text
    • http://vittorguxx.site/182778397386x5aq.pdfIn PDF document text
    • http://prognoz-football.club/early_season_bow_hunting_tips_wisconsinu476e.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwaseja/gejdjhz/vubukijigasek.pdfIn PDF document text
    • http://fsfsfd.xyz/literature_review_vs_systematic_reviewwt2oj.pdfIn PDF document text
    • https://cdn.sqhk.co/muzolorakow/bJlhagf/bebupenuzosuragoda.pdfIn PDF document text
    • https://tuxewuwa.weebly.com/uploads/1/3/4/7/134776055/e083f47f.pdfIn PDF document text
    • https://jewizebalize.weebly.com/uploads/1/3/4/6/134618682/c3f51e97f2defa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/lozuxesonawegedotoz.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/subnautica_prawn_suit_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC091 4976 bytes
SHA-256: d7e80bc9ae2b8423dda8531596486bc6e268816d2719ad5b24488af24df6bfa7
font_01_sfnt_off0000d194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD194 11304 bytes
SHA-256: a23484f773b912abb65ef9c48aef183c0542f90421caebe18c4c183c3298ff96

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