Malicious PDF — malware analysis report

Static analysis result for SHA-256 3618f2e160d049aa…

MALICIOUS

PDF

84.9 KB Created: 2021-01-05 20:46:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77e95aee4d48f0d16a5bb81064e56de4 SHA-1: 969ee3a8c8f73870355cb845b639d28bdf43f036 SHA-256: 3618f2e160d049aa879159a1238b1d8bd30314a8991440ad7111bf26bfe50e3c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' reveals a significant number of external links, suggesting a phishing or redirection scheme. The presence of embedded URLs further supports the attack pattern of luring users to external, potentially harmful content.

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://trafffi.ru/123?utm_term=simplifying+rational+expressions+answer+key
    • https://cdn.sqhk.co/sisadenev/SGhhmuw/us_army_officer_ranks_insignia.pdf
    • https://cdn.sqhk.co/wazafanez/rpzjiwD/turodexobomokuw.pdf
    • https://linulozaf.weebly.com/uploads/1/3/1/4/131437298/9442687.pdf
    • https://cdn.sqhk.co/xadowififux/jjpiihg/cannon_shot_in_head_while_riding_bike.pdf
    • https://cdn.sqhk.co/ranotigu/Gigiehi/easiest_way_to_get_adamantine_ff8.pdf
    • https://cdn.sqhk.co/gufezitaxato/fhiKje6/asteroid_news_2020_29_april.pdf
    • https://tezijiso.weebly.com/uploads/1/3/4/6/134690371/9088929.pdf
    • https://cdn.sqhk.co/fexivijemozu/WlcFlic/dead_trigger_zombie_killer_cider.pdf
    • https://cdn.sqhk.co/kiraxozi/ihbr25S/pozerokevizuvewikijofob.pdf
    • https://cdn.sqhk.co/dokederajo/eYhaij1/how_to_draw_halloween_monsters_easy.pdf
    • https://cdn.sqhk.co/feduvefas/3ghfghN/bifezumimixerigekadut.pdf
    • https://nolizusumebixaz.weebly.com/uploads/1/3/1/4/131438071/1e14303dce.pdf
    • https://teleroxekafi.weebly.com/uploads/1/3/5/3/135321942/bowake-jumazixopizil.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/eeaefa77-ed91-49bf-a668-2a32a204fe62/thordsen_pistol_stock.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011736.bin
14b697713bb0ce5918d79ba0c4f49a60b18337161342934a12d512ac8103b001		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11736 26256 bytes
font_00_sfnt_off0000dd12.bin
9eb1adbc6f6a31475a37b4aca03a6362e382440f515d46a27adee57440a59510		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD12 5652 bytes
font_01_sfnt_off0000f05d.bin
7d2080c82b47490493619ce7f4a92787c3b7ddcdab20856c8a796ecce2be002d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF05D 11300 bytes

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