Malicious PDF — malware analysis report

Static analysis result for SHA-256 db37767b87d7ff59…

MALICIOUS

PDF

70.8 KB Created: 2021-02-13 02:44:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: fcaf7caeb5a4e5d13461024c76c72e06 SHA-1: 8bb42b52ac5e5c6d2f7cd650c1b46c53ae9f2113 SHA-256: db37767b87d7ff590aede8ae7a052f3a614bce746cd092e608d10c5a1388805e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are on disposable domains, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://druttle.ru/123?utm_term=human+bone+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426279/normal_5fdb35c87dc98.pdfIn PDF document text
    • http://natlab.ru/york_electric_furnace_manualsvjinu.pdfIn PDF document text
    • http://webmastervlad.ru/87713795495q2dsn.pdfIn PDF document text
    • https://cdn.sqhk.co/medasozuf/3hfhanE/way_of_retribution_awakening_apk_obb.pdfIn PDF document text
    • https://cdn.sqhk.co/vibebexez/yj4jcid/21017498704.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/jibjQib/jofivilomi.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexofap/hauRUgc/sedenovasig.pdfIn PDF document text
    • https://cdn.sqhk.co/mavozopofug/e7ijfib/pc_games_more_about_greek_mythology.pdfIn PDF document text
    • http://pitushok.fun/bogan_movie_audio_songs_freepjh3m.pdfIn PDF document text
    • https://galewijukinez.weebly.com/uploads/1/3/2/6/132695540/bisegigezilob-pufunufididibig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406463/normal_5fdaaaed53358.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486045/normal_6027052426cf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463266/normal_601e063b0cec3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449990/normal_5ffe7c3a3445c.pdfIn PDF document text
    • http://stroiline74.ru/motor_world_car_factory_cheats86v2n.pdfIn PDF document text
    • https://secure-mediIn 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_off0000d9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F6 5012 bytes
SHA-256: 82ba76e96a579d675be333af0c263753f1482e765c38526ab5640317a3b0de3f
font_01_sfnt_off0000eaeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEB 10456 bytes
SHA-256: 7bda4765e5374b2fef4ec8b3262ec4217b0dabf10362d3238dd05d438ec9afee

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