Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c243913704ba1c…

MALICIOUS

PDF

78.4 KB Created: 2021-05-14 00:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47d022ef01a6ede2a5b548f43b1e95bd SHA-1: 2383235fa98c855733ce3933382daedd6da2e385 SHA-256: c9c243913704ba1c1dce3fa02ea2513ce5fa8d787ba74994447696ed49ac744d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gimoguvi.ru/strik?utm_term=software+tester+fresher+salary+in+india
    • https://lewozokor.weebly.com/uploads/1/3/5/4/135400983/fc1438fde0.pdf
    • https://magizixulu.weebly.com/uploads/1/3/0/7/130776273/lofedum-nifon-kemoxisi.pdf
    • https://defelidiko.weebly.com/uploads/1/3/1/0/131070982/d9de0438f.pdf
    • https://gudabujazoz.weebly.com/uploads/1/3/0/7/130739385/852efb923.pdf
    • https://cdn.sqhk.co/gemukojev/hiQWQOl/87016266562.pdf
    • https://cdn.sqhk.co/mitukutowum/jiZ3ich/through_the_ages_game_review.pdf
    • https://bejulukif.weebly.com/uploads/1/3/4/7/134746679/xulalideg.pdf
    • https://tilawifi.weebly.com/uploads/1/3/4/4/134480999/a2e59e3.pdf
    • https://tawugeri.weebly.com/uploads/1/3/4/7/134774142/zuvijimijatinageviv.pdf
    • https://cdn.sqhk.co/gixelotopa/bhzrWjb/good_plus_point_synonyme.pdf
    • http://woziwowariv.sportsontheweb.net/what_is_ethics_in_criminal_justice.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xomudufe/guvisuximugafuvobijagukin.pdf
    • https://s3.amazonaws.com/wizuluworafid/how_to_connect_2_bluetooth_headphones_to_samsung_tv.pdf
    • http://duvodix.myartsonline.com/gokip.pdf
    • https://s3.amazonaws.com/gorajikunobixi/78648645498.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dedf.bin
8d4754492a4b0d8733fe46ec037187610b1b5a4a5631f8b8f621aa0fc6be93b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDF 5292 bytes
font_01_sfnt_off0000f0f2.bin
bcd0b7066579c8187fa18005adcd93188981dee0ea1f0e6fa7bc453170795a5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F2 10724 bytes
font_02_sfnt_off000115ac.bin
c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115AC 16164 bytes

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