Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fe4608545234a37…

MALICIOUS

PDF

82.0 KB Created: 2021-04-03 22:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d731484e95c23b99d868af6d87f52966 SHA-1: 8237c2c8c75645c4907623b0deb8d57a86b552e8 SHA-256: 3fe4608545234a37e9f90f3a1f327792bcf23f322d538149717a5746ad960af8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with the primary URL pointing to a potential phishing lure related to 'acer abstract reasoning test pdf'. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/award?keyword=acer+abstract+reasoning+test+pdf
    • http://sodaapp.pro/ribijetudc49om.pdf
    • https://gunajogozezulom.weebly.com/uploads/1/3/5/3/135385825/871780.pdf
    • http://phrensy.co/dexegovg4h4v.pdf
    • http://aires.fun/125274006525phvw.pdf
    • http://megantv.site/ark_survival_evolved_nude_modnboar.pdf
    • https://wopurosifagup.weebly.com/uploads/1/3/5/3/135333772/9507145.pdf
    • https://reratedazakowim.weebly.com/uploads/1/3/1/3/131378897/b24cc26.pdf
    • https://vosujesu.weebly.com/uploads/1/3/4/6/134646347/vubab_dajatawokiw.pdf
    • http://lnstagramcopyrigtservice.com/what_is_existential_humanistic_therapybjf9o.pdf
    • http://pubggaming.online/jigoliwaxopovdp5xg.pdf
    • http://allieshouseofhope.com/did_ivan_drago_cheatxq5rl.pdf
    • http://com-signto2.xyz/423328293014o0jq.pdf
    • https://wujawosekeg.weebly.com/uploads/1/3/4/7/134712458/46770b69c3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://fecd0c08-032d-4b8b-b26c-6108aca7a00f.filesusr.com/ugd/a87c8b_5bd3ad8185cc42eeb765ff5753ec6796.pdf?index=true
    • http://diwukimip.epizy.com/53195873521.pdf
    • https://37e79482-e567-4eff-b449-6ea9b90d4679.filesusr.com/ugd/cff0cd_cd890742525345ffb01c9c3edcf1f58d.pdf?index=true
    • http://nulibipegetoko.epizy.com/local_anesthesia_malamed.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f51e.bin
9c0b51232f68710cb4203771151d0badd8cc2697b23b99242c452d49cb152941		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF51E 5208 bytes
font_01_sfnt_off000106d2.bin
e9bb802a1f72b70fa81b0f18a30f042b0fbffb551fba08ca2010d512e22687eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106D2 11016 bytes
font_02_sfnt_off00012c4c.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4C 4324 bytes

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