Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1523354e88e944…

MALICIOUS

PDF

71.9 KB Created: 2021-04-02 20:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c7de5f5396d2601c0196a837fb20985 SHA-1: bb2519d701374f747b602e0701cb7d4d3cf438d9 SHA-256: ca1523354e88e944302fd27f35e6f3cb5c66b0a3e29a6657a81758ae93d2435a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to distribute traffic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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://vilenefex.ru/strik?utm_term=possessive+pronouns+test+for+grade+2
    • https://cdn.sqhk.co/zisiribamen/gi8hhDx/81374550967.pdf
    • https://sufudoni.weebly.com/uploads/1/3/4/8/134853368/524e75b85a.pdf
    • https://cdn.sqhk.co/tatidukigag/ifiiLjf/55587452155.pdf
    • https://sogifeni.weebly.com/uploads/1/3/2/7/132712483/tarod-gaxomijawuxuziz.pdf
    • http://fosipuzo.mypressonline.com/hp_officejet_5740_printer_paper_jam.pdf
    • https://libadelalisam.weebly.com/uploads/1/3/4/5/134579317/561697.pdf
    • https://lujisitezolip.weebly.com/uploads/1/3/4/1/134109273/47148.pdf
    • http://nomevufaneboja.mypressonline.com/xunarubizepomejewunalumed.pdf
    • https://cdn.sqhk.co/dofexoxev/cEsigji/gojejefepulanalajazusod.pdf
    • https://migigazafakag.weebly.com/uploads/1/3/4/3/134377970/5102597.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://12350a4d-732a-4148-85a7-4fa27f2a77ec.filesusr.com/ugd/17beed_d02351eaa1834f1aa6af13c327136f59.pdf?index=true
    • http://pesetunal.onlinewebshop.net/xonofaxif.pdf
    • https://s3.amazonaws.com/tawosutosuxi/bass_guitar_fret_note_stickers.pdf
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_e052f99b80064404be28e0a01b4f7c12.pdf?index=true
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_3ec1d728caba4a5f881426002ce7375a.pdf?index=true
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_96c8209e07604f419caaeec05872621d.pdf?index=true
    • https://cfecb619-c0f5-418d-ae9d-b1147643389f.filesusr.com/ugd/4cd51e_2e4bd2fb62304e0e86c965ae511f562b.pdf?index=true
    • https://s3.amazonaws.com/pukaridimupo/netflix_1080p_chrome.pdf
    • https://704d67de-a0ba-412a-a77d-f8c4cf0d88a3.filesusr.com/ugd/a83d94_5d35a033227a446ea93fcf3d77f38968.pdf?index=true
    • https://9301df3d-c689-496c-811c-0581e5fecd74.filesusr.com/ugd/f62067_c0cbf5a5a4bc46f3a964e0aa7002e24e.pdf?index=true
    • 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_off0000d83d.bin
b70687ea025e4a920130eba5489516b8dc2024e530c70e2f78fb78e9f7305f81		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD83D 5368 bytes
font_01_sfnt_off0000ea9b.bin
1f76d9adbc6d6c9b1cb0ff66829345f27613a37295b252b808c6ebb8b26d9b00		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9B 11008 bytes

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