Malicious PDF — malware analysis report

Static analysis result for SHA-256 451778e2504be7c3…

MALICIOUS

PDF

79.0 KB Created: 2021-03-18 20:06:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2dddbb02ea0bdca9912f91efb8fb802c SHA-1: a9629f7c6b0319cba67a71a62ee038e20201a317 SHA-256: 451778e2504be7c30d4d13125b2cb951592045ff774a7da2b669f5d6c6b854cc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO poisoning tactic. One of the primary external URIs, 'https://fokemale.ru/wix?keyword=slader+modern+world+history+patterns+of+interactions', indicates a potential lure related to academic content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://fokemale.ru/wix?keyword=slader+modern+world+history+patterns+of+interactions
    • https://rixajijinuroje.weebly.com/uploads/1/3/4/4/134473879/9465683.pdf
    • https://vosanuxavuzom.weebly.com/uploads/1/3/6/0/136089669/dakisuga.pdf
    • http://tinesoxexi.22web.org/subepowularadegazukunogo.pdf
    • https://zajawegunane.weebly.com/uploads/1/3/4/3/134332092/6057136.pdf
    • https://furujito.weebly.com/uploads/1/3/1/3/131398045/pipuwuvip.pdf
    • https://kedadatiwuji.weebly.com/uploads/1/3/4/8/134891749/29dd97c57414.pdf
    • https://wanalupegekiful.weebly.com/uploads/1/3/4/8/134879682/kutaw.pdf
    • https://lizameguxif.weebly.com/uploads/1/3/1/6/131606128/73d48a.pdf
    • https://xitetufiwirisax.weebly.com/uploads/1/3/4/0/134041449/4487169.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://da99f664-88c7-4a27-98aa-0bbcec2e8f57.filesusr.com/ugd/66f3f9_057bbe5d30754b9383807aa6bb1dad97.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6875e635-48fb-475f-a940-c4093a5d344d/gaxeginabafi.pdf
    • http://tiwevivixijobor.epizy.com/vofem.pdf
    • http://wawaxujogoned.rf.gd/capture_screen_application_android.pdf
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_4e26b49ea5f3475ba98d705c9cc03822.pdf?index=true
    • http://lamekukibudinos.epizy.com/22801760835.pdf
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_5c98bf14ae08436b8591fda7d8ce14ae.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f4a7b6ae-1433-480d-94cc-47a2c07a796a/head_first_android_development_a_brain-friendly_guide_3rd_edition.pdf
    • http://damusoborubumo.epizy.com/vutovabifemogafete.pdf
    • http://vurorevebosexu.rf.gd/assets_and_liabilities_format_in_kannada.pdf
    • https://uploads.strikinglycdn.com/files/b6c57097-a251-48eb-8e0c-944bbc9e5148/what_weight_oil_in_air_compressor.pdf
    • http://tofegegumenoz.rf.gd/43410069725.pdf
    • https://uploads.strikinglycdn.com/files/cc4a6b12-3418-4f0b-8574-2f9cdd481421/vetibexonefo.pdf
    • https://uploads.strikinglycdn.com/files/68596c82-f0cb-432d-8a57-fc8b9612051b/27723209260.pdf
    • http://fidepogomuvi.rf.gd/unicorn_electronic_dartboard_cabinet_set.pdf
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_6c27a39f371242ee96d1f6a4bd47e1ae.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_off0000f4d5.bin
6ea212beefd3d92c6c5a7e8f027978f808ba06fd995cb6aa3c9c691f18752937		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D5 5692 bytes
font_01_sfnt_off00010828.bin
48d01d448fe72ac9001059d8fec8498fb6c5921af30bb04881cf06d538220844		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10828 10584 bytes

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