Malicious PDF — malware analysis report

Static analysis result for SHA-256 db733426acc0b6f4…

MALICIOUS

PDF

77.9 KB Created: 2021-03-19 04:12:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: dd068b76ea83839a9e1a6b2a72a73071 SHA-1: d1beef77ba7658a3c9605f57e692090d720e35b6 SHA-256: db733426acc0b6f4465a83c3d2e37955886a7f0c4a751d2606d1f70d16cf5fa3
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an external URI pointing to 'https://ponafet.ru/strik?utm_term=self-reliance+summary+pdf', which is likely used for phishing or to download a secondary payload. The document body, though heavily obfuscated, contains references to 'self-reliance summary pdf' and 'wkhtmltopdf', suggesting a lure to disguise malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/strik?utm_term=self-reliance+summary+pdf PDF link annotation
    • http://jerubapuruzol.iblogger.org/86021924913.pdfIn PDF document text
    • https://cdn.sqhk.co/zolususux/eILEiiF/chocolate_movie_mp4_video_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/ijyhihh/farm_ranch_jobs_in_nebraska.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415745/normal_5ff4e39fe92df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450242/normal_60097867c4bb9.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/iuepfGB/hay_day_wiki_lobster.pdfIn PDF document text
    • https://cdn.sqhk.co/dubikureta/6idBgdP/swathing_in_a_sentence.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/wipotegadodorek/budget_bid_template_nz.pdfIn PDF document text
    • https://931f52e6-cb68-4a93-8e02-54808d33f8b6.filesusr.com/ugd/6290de_34937e274cd54b568d0ef85e34393c7b.pdf?index=trueIn PDF document text
    • http://dudulexo.epizy.com/vamajusejuxowakorogovew.pdfIn PDF document text
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_d08132708f974e27b9504cb1ba9cd550.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/meludav/darth_vader_theme_sheet_music_violin.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/14853821721.pdfIn PDF document text
    • https://45f0f727-c607-4398-b3b7-8b42e23b21b2.filesusr.com/ugd/0a84ca_2f73fc756c1845169161a14b25ac9939.pdf?index=trueIn PDF document text
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_4c94e60ebba24c93b9283601527255bc.pdf?index=trueIn PDF document text
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_1fc2463cabbe472284771a8542e69446.pdf?index=trueIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_bd02dae2e5e84ae8bcad6c28953cbe1f.pdf?index=trueIn PDF document text
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_8694481860fd4808bc489e8b1ab27398.pdf?index=trueIn PDF document text
    • https://a765b249-d442-4b07-8ea9-8318d996b894.filesusr.com/ugd/902d29_a7f1f1ece77849a494e90549d597eecd.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_off0000f1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BF 5536 bytes
SHA-256: 3d8a20d138b37aa238440e430d0c57fc35008cc7ac22d683e39eaf9070cb3b9b
font_01_sfnt_off0001048d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048D 10960 bytes
SHA-256: 402f1219a95d5b5ab36af5efc14da7c437195cabc5f8b319b6cfe729fdc9c8ac

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