Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa5bc1afa11b959…

MALICIOUS

PDF

84.6 KB Created: 2021-05-06 09:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54412f27df35404b84f020c04e7faad4 SHA-1: 2ff682e6412e331dae97b303878f57277c94f13f SHA-256: 7aa5bc1afa11b9598572b0efe112280842d53a8483de2b9b02b2c2bdb45135d3
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing indicating a link farm with numerous external PDF links, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV also flagged this file as malicious. While no scripts were extracted, the presence of many suspicious URLs points towards an attempt to redirect users to malicious content, likely for credential harvesting or malware delivery.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cdn.sqhk.co/baluwofuk/Bgfhfid/battle_chasers_nightwar_trainer_23731.pdf
    • http://ovca.space/xusoginuluniwuder9wuxc.pdf
    • http://blue-tick-central.com/83215812438vv98g.pdf
    • http://prod-fruit.space/bucknell_campus_map7co0a.pdf
    • https://mazogerivajusem.weebly.com/uploads/1/3/4/3/134341978/2898146.pdf
    • https://cdn.sqhk.co/ledodatefu/7w8v6pH/vugezed.pdf
    • http://meetdouche.xyz/rules_of_crib_3_playersh182n.pdf
    • https://xuzizalebu.weebly.com/uploads/1/3/4/7/134772475/jaxusejeximagez.pdf
    • https://fivoputan.weebly.com/uploads/1/3/1/4/131408393/9763534.pdf
    • http://babysampler.com/kasuvanenawodizujyr0k.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://feedproxy.google.com/~r/wb/ENAH/~3/kMuynZNWtA0/wb?keyword=painting%20ideas%20for%20walls%20interior
    • https://uploads.strikinglycdn.com/files/cfbc9fa7-d878-40ad-8c26-b6cf3aab9fc3/jack_and_the_beanstalk_movie_2020.pdf
    • https://uploads.strikinglycdn.com/files/eb28c6a1-d69b-479e-afff-8cbd01754898/moduwamolavemodedukubez.pdf
    • https://uploads.strikinglycdn.com/files/20110a86-711c-4b9a-8b43-39ff22ca682a/the_open_window_answers_key.pdf
    • https://uploads.strikinglycdn.com/files/795492c4-3d38-42dd-a7af-9be7345bfcad/slouching_towards_bethlehem_lyrics_joni_mitchell.pdf
    • https://uploads.strikinglycdn.com/files/9eff482c-43af-424c-b3e4-57444e0cfa88/minebopokikoxijiwev.pdf
    • https://uploads.strikinglycdn.com/files/3fad008c-62d4-4fdb-b0b0-424f887778f6/88405660752.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_off0001036f.bin
5a81e435f319edd3c15aff20fd177dfab556c37a70dcd5f4fca95df5ecfa6be2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1036F 4956 bytes
font_01_sfnt_off00011460.bin
41369521515abd7b08adc337e73cefa6450899c474e549010625a8d70f90d6a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11460 10284 bytes
font_02_sfnt_off0001376b.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1376B 4324 bytes

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