Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c73d131d89f6293…

MALICIOUS

PDF

80.7 KB Created: 2021-03-24 20:11:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c71f3d186bd71de61e46ed38fed43a4c SHA-1: abbb89d9969de71b5bfc342d133e04d12f2ab24e SHA-256: 4c73d131d89f6293afa452f42ad0f0fc4c6eee4708db207e2236862b1bc36ccd
156 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The document body is heavily obfuscated, but the presence of external URIs and the PDF_SEO_LINK_FARM heuristic strongly suggest the intent is to redirect users to potentially harmful sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://vilenefex.ru/wix?keyword=cherry+hill+fire+department+salary
    • http://maslovauto.ru/step_3_resultnmqpj.pdf
    • https://pimipile.weebly.com/uploads/1/3/4/8/134883166/317c521345c90.pdf
    • https://jimuvidagonolab.weebly.com/uploads/1/3/1/6/131636746/1a29c53a253a986.pdf
    • https://kixasakuzejud.weebly.com/uploads/1/3/5/3/135347884/gotetufabuzujepa.pdf
    • https://marutonekuposew.weebly.com/uploads/1/3/1/6/131606360/dapesupom_mevurukufonud_fomupeme.pdf
    • https://gixefizavemo.weebly.com/uploads/1/3/4/1/134108956/zolosolisewero-dodoromifake-zuwosisipena-rifemimomiwulej.pdf
    • http://wegoduxevuda.iblogger.org/94224981337.pdf
    • http://chelamela.org/xapabizokautdf.pdf
    • https://vujebitaj.weebly.com/uploads/1/3/4/7/134759162/4397705.pdf
    • http://lnstagramcopyrightservices.org/433126701422u21r.pdf
    • https://tojewenegekov.weebly.com/uploads/1/3/4/5/134502344/5846058.pdf
    • https://zazozoke.weebly.com/uploads/1/3/0/7/130776388/bfd9547aad295cd.pdf
    • http://wagagawoduzom.iblogger.org/breeding_guide_for_pokemon_sun_and_moon.pdf
    • http://maska-respirator.com/jowaxipawuluzubnzu0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2ce5d5d5-9902-478c-88c1-b3ee265f2f2e/the_merchant_of_venice_bassanio_characteristics.pdf
    • http://kitomov.epizy.com/us_attorneys_office_sdny_internship.pdf
    • https://uploads.strikinglycdn.com/files/82909d08-247b-4e6d-8042-43ab81d82ef9/dabobonuzezivu.pdf
    • http://tezadoni.rf.gd/manorev.pdf
    • http://fitunugiwa.rf.gd/15014790909.pdf
    • http://pizibajavodup.epizy.com/rokebopiragezov.pdf
    • http://wuvisefop.epizy.com/218259499.pdf
    • https://uploads.strikinglycdn.com/files/da13e262-a964-4b80-93da-1c89b29dd61f/pegebibanigura.pdf
    • https://uploads.strikinglycdn.com/files/154005c9-ef03-4175-99b2-89c01c11a0b4/are_all_sentry_safes_fireproof.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faa1.bin
ba5cffd91a1d3f5a81b76e0c3d8c0c7a3d83d22498a6cd556561e47935c32bff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA1 5288 bytes
font_01_sfnt_off00010c75.bin
01df3d395c5b475249aad3fe9c9ed6dcb4bc08a1a8885e236ead1eaaea0439ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C75 11576 bytes

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