Malicious PDF — malware analysis report

Static analysis result for SHA-256 7acfbc55f5f68870…

MALICIOUS

PDF

84.2 KB Created: 2021-04-23 08:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73cf71fd091865a20f2ba8337ffb1504 SHA-1: 516a91cf781d76f3c6c0002f81651227cf3f5dc8 SHA-256: 7acfbc55f5f6887059cbfcef1da4d26179262531ade416b86daa42785b9cbad5
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on disposable domains, often with UTM parameters, suggesting an attempt to manipulate search engine results or lure users with deceptive content like movie downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/strik?utm_term=the+hobbit+hindi+dubbed+720p+movie+download
    • https://static.s123-cdn-static.com/uploads/4499979/normal_5ff413f794b24.pdf
    • https://cdn-cms.f-static.net/uploads/4383687/normal_5fdaff99687b8.pdf
    • http://setopin.mypressonline.com/ramayana_story_english.pdf
    • http://lulizukudomiz.scienceontheweb.net/7554024072.pdf
    • http://niwizonoleror.mywebcommunity.org/mufupelewefod.pdf
    • https://cdn-cms.f-static.net/uploads/4456135/normal_606d460c3f92b.pdf
    • http://selafakokag.22web.org/xuzivube.pdf
    • https://cdn-cms.f-static.net/uploads/4450889/normal_601952f4b1d88.pdf
    • https://cdn-cms.f-static.net/uploads/4475559/normal_603b1e7ed90bc.pdf
    • https://static.s123-cdn-static.com/uploads/4498992/normal_5ff8965415f83.pdf
    • http://worameruvejaka.mywebcommunity.org/53374259617.pdf
    • http://wugafis.66ghz.com/segubizizideganekakiw.pdf
    • https://static.s123-cdn-static.com/uploads/4465015/normal_5fdd1b95ae549.pdf
    • https://cdn-cms.f-static.net/uploads/4493873/normal_6065f83c46cd8.pdf
    • http://tuzojexis.mypressonline.com/14530726259.pdf
    • http://lelazuw.iblogger.org/traducir_archivo_en_ingles_a_espaol_gratis.pdf
    • https://static.s123-cdn-static.com/uploads/4466391/normal_5ffd6d8472ea6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/188553ef-7a0d-4d17-8522-3c3879cc538f/76949726441.pdf
    • https://uploads.strikinglycdn.com/files/47ef19a1-d5a0-47f7-8174-1cf8c3b613c7/67586954056.pdf
    • http://kugibujupedo.rf.gd/bebuv.pdf
    • http://bofozavo.rf.gd/citizen_navihawk_blue_angels_worldtime_c300-q00842.pdf
    • http://gegavolaful.epizy.com/32509330593.pdf
    • https://uploads.strikinglycdn.com/files/a1d6a6b9-fb0b-4986-9a6f-2e85bbb6b4ce/nikon_m_308_scope_manual.pdf
    • http://fitewuvo.rf.gd/kuxazanoke.pdf
    • https://uploads.strikinglycdn.com/files/19bc0ada-7385-4a25-bbc4-014348e846ce/oxgord_ms300_manual.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bb2.bin
ad1e58687dff1c922579be525f03198aaf8dce91c83b79f445ea39e2d2d8fa45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB2 5520 bytes
font_01_sfnt_off00011e63.bin
ce350cf7342ad9c3a781e03a782578ce52ef6fb81e83d813ef3dfdb828c9d552		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E63 10792 bytes

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