Malicious PDF — malware analysis report

Static analysis result for SHA-256 512c3d7dc4ecbe2b…

MALICIOUS

PDF

60.5 KB Created: 2020-12-16 19:22:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe3755aee4a59dc25bd92535ec4a20e7 SHA-1: 766294b152bc06ecb87da2a7b82eced238499fc0 SHA-256: 512c3d7dc4ecbe2bb08517d57e9a46a326887f0b6e6a2d2a5d4c9fc3da6a21e1
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a ClamAV detection and an ML classifier. It contains numerous external links, with a critical heuristic identifying a PDF link farm. One prominent URL, 'https://traffine.ru/strik?utm_term=mt+olive+baptist+church+houston+tx', is likely part of a phishing or malware distribution scheme. The document body is heavily obfuscated, but the presence of embedded URLs and the link farm heuristic strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffine.ru/strik?utm_term=mt+olive+baptist+church+houston+tx
    • https://vafumigoku.weebly.com/uploads/1/3/1/3/131384305/729e4c825fe865.pdf
    • https://padudarudiloga.weebly.com/uploads/1/3/4/7/134714427/kiwawid.pdf
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/6f5be3a943e.pdf
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/c9f91ef5.pdf
    • https://zuxosudeti.weebly.com/uploads/1/3/4/3/134359900/9829336.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/purawuma/88879338170.pdf
    • https://s3.amazonaws.com/jubiferekaka/web_browser_on_samsung_smart_tv.pdf
    • https://static1.squarespace.com/static/5fc0bdc717e7202640e9644a/t/5fc10b90bc819f1cf4fcf335/1606486933602/density_practice_problems_worksheet_chemistry.pdf
    • https://static1.squarespace.com/static/5fc0cc6dc14dfd36fef0f123/t/5fd1148f60fb6f3d0d226032/1607537807946/zizosutikedo.pdf
    • https://static1.squarespace.com/static/5fc56ff268612547ed7c87b1/t/5fc8ee425b325f76422d65e0/1607003714817/that_level_again_nivel_23.pdf
    • https://uploads.strikinglycdn.com/files/79932978-ed56-408c-80df-93d59a794c6b/compas_y_el_diamantito_legendario_pd.pdf
    • https://s3.amazonaws.com/genijusemu/gogugezerurijaxuzu.pdf
    • https://static1.squarespace.com/static/5fc147faab79f442f22c3419/t/5fc60912f3de5e49b5344c00/1606813971209/final_verdicts_the_crucible_answers.pdf
    • https://static1.squarespace.com/static/5fc5ba7e0a2757459b03f866/t/5fc6c2a493ad1a481205166e/1606861479672/bidonukisavedez.pdf
    • https://s3.amazonaws.com/bufexa/mathxl_get_answers.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_off0000b0f6.bin
bc7fa74bdd3c40a86ddc256ae7d8a1eb0257137a676468e79c1741091b884371		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F6 5296 bytes
font_01_sfnt_off0000c300.bin
c8eed28dac4fa60cc76cf413f1810802860138fb78937534efd0030108a62b32		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC300 9976 bytes

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