Malicious PDF — malware analysis report

Static analysis result for SHA-256 a92ddf4a5fae7b85…

MALICIOUS

PDF

119.4 KB Created: 2021-02-21 15:21:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8f2dab47a700f1ca231d11974f846f0c SHA-1: 1788273a4d1ff8d93586aee7226505729b85b0ee SHA-256: a92ddf4a5fae7b851229084a7a9d9338f696ebdecb8be1a1119389ab040341b6
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=super+mario+bros+2+3ds+w2-castle+star+coins PDF link annotation
    • https://kenojulovananav.weebly.com/uploads/1/3/4/0/134016885/3414223.pdfIn PDF document text
    • https://weduparazibad.weebly.com/uploads/1/3/4/7/134710999/947678.pdfIn PDF document text
    • https://kefomituwo.weebly.com/uploads/1/3/2/8/132815939/3d2cbb51d4a1.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/KlnhbAv/brick_out_shoot_the_ball.pdfIn PDF document text
    • http://edayafar.xyz/gipuzosetudagakfg4m2.pdfIn PDF document text
    • http://hookup671.site/dublin_airport_departures_informationpmw55.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/ijphfgg/30651980619.pdfIn PDF document text
    • http://forpost-electrica.ru/how_to_write_freestyle_rap_lyrics0lfh8.pdfIn PDF document text
    • https://wesoxiworikezux.weebly.com/uploads/1/3/1/3/131380467/4488525.pdfIn PDF document text
    • http://grusha.space/21755975696vac7t.pdfIn PDF document text
    • https://cdn.sqhk.co/kunimanujage/ghAihhd/bus_rush_2_game_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/99163272226.pdfIn 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_off000197a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197A7 5880 bytes
SHA-256: a028b1b0b899c5413f9b975d13cf77ddbe45485b508c943ac93b50838a821746
font_01_sfnt_off0001ab9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB9D 10680 bytes
SHA-256: 436d1f48a8911ed7f9d710e8ba1d030334ac56810d8039ff885b398e1a96b3b0

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