Malicious PDF — malware analysis report

Static analysis result for SHA-256 492d3619ae49307f…

MALICIOUS

PDF

71.0 KB Created: 2021-01-26 11:59:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-31
MD5: 2e548b3fbddad49cb2c5b2eb3ca2acf0 SHA-1: 8f3cda75baf378631b865ab6855115b8756aeb05 SHA-256: 492d3619ae49307f76a28474c949411a57d95902caf2427eae60ba7a7dc37ab8
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is structured as a link farm, with many links pointing to disposable hosting. The document body, though heavily obfuscated, suggests a lure related to 'Discord color text 2019', likely a pretext to drive users to the listed malicious URLs for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://traffset.ru/123?utm_term=discord+color+text+2019 PDF link annotation
    • http://nexojofe.22web.org/piveven.pdfIn PDF document text
    • http://winoorama.space/29010001395jhsoh.pdfIn PDF document text
    • http://metazoaapc.fun/greatest_hits_of_the_90s_playlistttxj6.pdfIn PDF document text
    • http://www19216801.site/waremuniruzanujidezysu85.pdfIn PDF document text
    • https://cdn.sqhk.co/diratukuz/jgkjdhi/12967591773.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425784/normal_5fcb9762e9812.pdfIn PDF document text
    • https://cdn.sqhk.co/lojumisebu/UjbIhfA/morizoketigegowaporu.pdfIn PDF document text
    • http://waystep.site/icy_veins_fury_warrior_talentsha1mn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410194/normal_600270bf3858f.pdfIn PDF document text
    • http://italdom.fun/87697808962bteop.pdfIn PDF document text
    • http://usmileofficial.site/naturalizer_boots_amazon2t6p4.pdfIn PDF document text
    • https://cdn.sqhk.co/sirepajaku/hhfjgib/lusetuma.pdfIn PDF document text
    • http://mainsale.pro/best_hashtags_for_instagram_followers_and_likesnxsax.pdfIn PDF document text
    • https://cdn.sqhk.co/tozegatopaxu/8CH4kPM/4725410911.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452607/normal_6007ea43b0ee0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D2 5272 bytes
SHA-256: c4e9632960735bfdc76956403862234a72317134d871c3086fb8b14402f668b7
font_01_sfnt_off0000e9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DC 11036 bytes
SHA-256: 7c15ee5c8b1faecb3457d27decd16b1fc2a3d17cb72003fc9e824602173f40ce

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