Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3217f952229fdfb…

MALICIOUS

PDF

77.6 KB Created: 2021-01-28 23:26:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1236a636fa99c1ce9300e39d54996405 SHA-1: 911a827edf6cbbe1fb48d66df2146a717e945930 SHA-256: c3217f952229fdfb497220e21672c875d4f7ce72927e0abd1b330e57d5b2ca9c
184 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting and redirector infrastructure, indicating a phishing or scam attempt. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a link to 'crophysi.ru' as malicious. The ML classifier and ClamAV detection strongly support the malicious nature of this file. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wb?keyword=action%20replay%20drivers%20windows%2010 In PDF document text
    • https://cdn.sqhk.co/dodalowogiv/heAdGic/79212512190.pdfIn PDF document text
    • http://hookup158.fun/7_wonders_of_the_world_list_with_images70nq2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448744/normal_600743af7f19c.pdfIn PDF document text
    • http://tohld.in/vorirv3l6t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454184/normal_600dbf2ab94d2.pdfIn PDF document text
    • http://jobs-ingenieur.best/12068906793w2p9f.pdfIn PDF document text
    • https://sinekagu.weebly.com/uploads/1/3/4/8/134855021/2ab05.pdfIn PDF document text
    • https://dupagerenukuxat.weebly.com/uploads/1/3/4/7/134751723/6635620.pdfIn PDF document text
    • https://zezevibowavaki.weebly.com/uploads/1/3/4/8/134854125/vadowo-pitasiderexo-pikola.pdfIn PDF document text
    • https://livurexile.weebly.com/uploads/1/3/2/6/132695833/1580417.pdfIn PDF document text
    • https://cdn.sqhk.co/pozuwifofub/hhdjgih/dragon_city_game.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388612/normal_5ff2cb1e15021.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369503/normal_5fdb52bea1987.pdfIn PDF document text
    • https://resodarapasak.weebly.com/uploads/1/3/4/6/134659305/5cab3.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/piwupevivotixi/msi_afterburner_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/33691416247.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/3ds_games_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/19724728572.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_off0000ed03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED03 5504 bytes
SHA-256: f30bc975039cc87b594f3dd75b12b3a2d2159cc156d164ded5242f3b015198d7
font_01_sfnt_off0000ffea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEA 12916 bytes
SHA-256: 0bf726f9a29f767421b06a1aa346734f1a239d150d0fec91be739ee4ee98996b

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