Malicious PDF — malware analysis report

Static analysis result for SHA-256 56338badd4227600…

MALICIOUS

PDF

65.0 KB Created: 2021-06-02 08:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43b33b62a694747a074d470dfa69f870 SHA-1: 810d5ac981fdccd68701bef9167f041e0d25dbd8 SHA-256: 56338badd42276009187633b4f3e939ae8134f33680c3b8fce151c4b08c1a6dd
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 pointing to other PDFs, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

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://lozipotod.ru/123?utm_term=triangle+similarity+proofs+worksheet
    • https://mutazodot.weebly.com/uploads/1/3/0/8/130874237/c48c3eba.pdf
    • https://zamigemunizi.weebly.com/uploads/1/3/4/3/134347724/4330195.pdf
    • https://xanilavobug.weebly.com/uploads/1/3/5/9/135959945/9114540de.pdf
    • https://nenopejir.weebly.com/uploads/1/3/4/6/134603535/4f6e85b8.pdf
    • https://gizibufunete.weebly.com/uploads/1/3/4/4/134492386/9764995.pdf
    • https://padotugaladod.weebly.com/uploads/1/3/4/6/134615244/3294625.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fixulirulafa.pbworks.com/f/77606834667.pdf
    • https://uploads.strikinglycdn.com/files/130bade6-5df0-4b21-afa8-efa6108c9409/how_to_stop_cat_separation_anxiety.pdf
    • https://uploads.strikinglycdn.com/files/bcc345cc-289d-4bef-a984-bc3a6a88c173/75309764190.pdf
    • https://uploads.strikinglycdn.com/files/e613ee36-8946-4a32-aa2c-3a692bdd9f95/25926452169.pdf
    • http://gibuwodebu.pbworks.com/f/77953856125.pdf
    • https://uploads.strikinglycdn.com/files/4d5b2c8f-48db-4b7b-a0c5-15c95c68bb54/2007_chevy_cobalt_repair_manual.pdf
    • https://uploads.strikinglycdn.com/files/1d1c1de4-3af0-41d1-9f4e-afd763787320/how_to_use_my_cobra_radar_detector.pdf
    • https://uploads.strikinglycdn.com/files/7b3ac9be-78f3-4e7a-9fe6-f1b901dd10f8/kayla_itsines_plank_challenge.pdf
    • https://uploads.strikinglycdn.com/files/8054afe3-1232-4858-af85-627cc30d1b08/is_dark_the_best_series_on_netflix.pdf
    • https://uploads.strikinglycdn.com/files/172b6194-c8a4-4a3f-847f-e02c0d6624ba/cisco_re1000_ip.pdf
    • https://uploads.strikinglycdn.com/files/8f944e97-3997-4e88-bbc6-bc2c172090b3/2003_dodge_durango_slt_towing_capacity.pdf
    • https://uploads.strikinglycdn.com/files/4d4ac722-7dfa-40c4-9dcf-54f53962a551/using_fuzzy_lookup.pdf
    • https://uploads.strikinglycdn.com/files/085b221e-e599-4df8-b092-1edcb922ffe0/21021583118.pdf
    • https://uploads.strikinglycdn.com/files/b48b53ad-7a92-4795-b816-ed68427be444/adventure_of_huckleberry_finn_summary.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_off0000c394.bin
bb40b6d0eb5e78884fa6143cad93219ecf572951b2867aec9236ea83388ed13f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC394 5524 bytes
font_01_sfnt_off0000d64a.bin
82181947529e62c98689ac758ca036172f9f6bde3d86ad5be13a8b92cb41884c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD64A 9492 bytes

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