Malicious PDF — malware analysis report

Static analysis result for SHA-256 3655ab6f5d6ba6b1…

MALICIOUS

PDF

85.5 KB Created: 2021-03-31 09:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61c3dfffcb958e56825956dcf6ddde66 SHA-1: bb48f92a964241d82da2978dee448b3d45d183d5 SHA-256: 3655ab6f5d6ba6b130c1d4e43d7ab75132ab3b57cc17121b989c69675c887f6d
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or SEO spam campaign, designed to drive traffic to malicious or low-reputation websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/strik?utm_term=personajes+famosos+de+mexico+muertos
    • http://pusikoxelumide.iblogger.org/57086237228.pdf
    • http://dusibarupuguli.medianewsonline.com/76588573546.pdf
    • http://naturebiolog.space/xuwanodekz5o1p.pdf
    • https://gutamunimidujad.weebly.com/uploads/1/3/4/6/134667749/fatosad-fefegoseg-gukiwa.pdf
    • https://tafopolen.weebly.com/uploads/1/3/4/3/134396822/4cdd112805a5ba5.pdf
    • https://lugilalosu.weebly.com/uploads/1/3/4/3/134314137/8261371.pdf
    • http://evakuator-uga.ru/xukabonanamot2w6lv.pdf
    • http://twoup-viktoria.online/rezivejuloka890h5.pdf
    • https://xupazipul.weebly.com/uploads/1/3/5/3/135325103/tutunogu.pdf
    • http://dosubodanes.mypressonline.com/xilatimesowuvepam.pdf
    • https://kiwiwutirove.weebly.com/uploads/1/3/4/7/134707888/db4dea3cbef6df.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_93ad495778f440678be0ddf2f97232f8.pdf?index=true
    • https://s3.amazonaws.com/vebogotexaf/simplifying_algebraic_expressions_with_indices_worksheets.pdf
    • https://s3.amazonaws.com/savifin/93036198999.pdf
    • http://daforewepon.epizy.com/hide_action_bar_android_on_scroll.pdf
    • http://zefesuk.epizy.com/how_to_cook_whole_chicken_wings_in_crock_pot.pdf
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_ee873b06791a48878ca92a243e6f9ebb.pdf?index=true
    • https://s3.amazonaws.com/bisiku/classical_analytical_chemistry.pdf
    • https://s3.amazonaws.com/napisakaluja/1st_quadrant_coordinate_plane_worksheets.pdf
    • http://pufovipejofag.epizy.com/adjective_and_adverb_worksheets_with_answer_key.pdf
    • http://bitenozof.atwebpages.com/perfect_conduct_ascertaining_the_three_vows.pdf
    • https://s3.amazonaws.com/watajive/40136529169.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_off00010a34.bin
5f48369c0cacc9eaa6dd0999a9313767279519f999ed8f5dafa17bffde739308		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A34 5280 bytes
font_01_sfnt_off00011c17.bin
19b1774c06e3f6fe8a3555fc5326749bfdb2602283f2b5702f59eb15e63ef175		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C17 13392 bytes

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