Malicious PDF — malware analysis report

Static analysis result for SHA-256 c48e0f36c4bf6b0f…

MALICIOUS

PDF

81.1 KB Created: 2021-03-10 14:59:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c369ae7c2087c999bd5fa467262bd52 SHA-1: c8f5a4d8c490b04ce142d899d9685cbc471bc145 SHA-256: c48e0f36c4bf6b0fc79714f7085ae18fdc220760e1a6771070c72ea4920667af
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 point to other PDF files, suggesting a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs implies an attempt to redirect the user 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/award?keyword=nietzsche+beyond+good+and+evil+free+pdf
    • https://cdn-cms.f-static.net/uploads/4383131/normal_5fd33effc278a.pdf
    • https://cdn.sqhk.co/xefilelo/f1DOggV/best_90_s_english_songs_mp3_download.pdf
    • https://cdn-cms.f-static.net/uploads/4385436/normal_6031f663853f1.pdf
    • https://static.s123-cdn-static.com/uploads/4413865/normal_5ff4cebcb2e09.pdf
    • https://cdn.sqhk.co/nizekidido/dihhjif/lego_star_wars_death_star_gunner.pdf
    • https://lulipexo.weebly.com/uploads/1/3/5/2/135294167/e1812569ff2fa.pdf
    • https://cdn.sqhk.co/mopomotop/hMibjgN/download_world_of_empires_2_mod_apk.pdf
    • https://pixerogamaba.weebly.com/uploads/1/3/1/8/131871590/mepawafujodimij_wonaxoj_kakemowef_xejiwelimuki.pdf
    • https://static.s123-cdn-static.com/uploads/4379846/normal_60095cc97c934.pdf
    • https://vuwapelenepaje.weebly.com/uploads/1/3/4/7/134705438/3179623.pdf
    • https://cdn.sqhk.co/wiwuwigo/Hsjdfy0/5402431016.pdf
    • https://tojaxufuvubugo.weebly.com/uploads/1/3/4/6/134641466/nujidisiti_mujeto.pdf
    • https://cdn.sqhk.co/xiwapusumoge/gghiecZ/477002489.pdf
    • https://cdn.sqhk.co/golemejexeno/K2hdhgd/human_trunk_crossword_puzzle_clue.pdf
    • https://pekavodasusoku.weebly.com/uploads/1/3/5/9/135982803/8424905.pdf
    • https://cdn.sqhk.co/momujolo/erLNig2/ironclad_guide_slay_the_spire.pdf
    • https://cdn.sqhk.co/komagiju/zjijdjj/banisadubixisoxelusifub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wixatax/lakeville_weather_report.pdf
    • https://s3.amazonaws.com/rewepalazamiso/jeverirabowefunaxa.pdf
    • https://s3.amazonaws.com/dosipive/clarence_larkin_revelation.pdf
    • https://s3.amazonaws.com/kesumasaka/tafatiditugumu.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_off0000fffb.bin
0c883d5275233bda26a6669a259f3ab4258890f751f0327f5b6f5c56a0afdc84		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFB 5740 bytes
font_01_sfnt_off0001139e.bin
344105f80a1014af1c4c84cec13cc18e022a64be122420299bbd38624c2a557c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1139E 10196 bytes

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