Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7af153f93df430e…

MALICIOUS

PDF

86.1 KB Created: 2021-03-30 07:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a5f57f4712daed989a9c4951cb46aaaf SHA-1: 7ba7819b86a5699fe77531a68cec68685984d803 SHA-256: b7af153f93df430ed05b2a984e3e3f57e5e16a6b2dfccaba3059ed8a51ac5eef
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document is flagged as malicious by ML classifiers and ClamAV, and contains heuristics indicating it's a link farm and a remote support lure. The document body, though heavily obfuscated, suggests a service manual theme, which is a common pretext for unsolicited remote access requests. The embedded URLs likely lead to further malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://pelibifir.ru/strik?utm_term=poulan+wild+thing+2375+service+manual PDF link annotation
    • http://nesobaka3.xyz/73663312381igjwl.pdfIn PDF document text
    • http://lnstagramlivesupportcenter.com/odia_song_2018_video_hd_djwnlah.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxarogajib/jhKhagc/allegiant_stadium_jobs_part_time.pdfIn PDF document text
    • http://govugododuwo.iblogger.org/caterpillar_3412_generator_specifications.pdfIn PDF document text
    • http://fasadi.site/47845720160ohcr3.pdfIn PDF document text
    • https://cdn.sqhk.co/fojevimexu/ibjgiho/tavozafuwuk.pdfIn PDF document text
    • http://mixed-rootwork.com/the_hundred_year_marathon_redditjwjvh.pdfIn PDF document text
    • http://bcpzonasegurape2-viabcp.com/anydesk_free_windows_7g4xcc.pdfIn PDF document text
    • http://sk-anker.ru/45051084393ubxne.pdfIn PDF document text
    • http://nadahul.ru/o_que__marketing_digital_de_afiliadospmwiq.pdfIn PDF document text
    • https://cdn.sqhk.co/mewowoji/MaRAjaR/8067637478.pdfIn PDF document text
    • https://cdn.sqhk.co/lotidonita/jdijLbI/turbofly_hd_mod_apk_download.pdfIn PDF document text
    • http://lisovad.22web.org/95264273453.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kufalogomisag.epizy.com/76401504879.pdfIn PDF document text
    • http://mupudozu.epizy.com/attributive_clause.pdfIn PDF document text
    • http://rerumixididepu.rf.gd/3686194300.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/tezaped.pdfIn PDF document text
    • http://gebetipuraxos.rf.gd/dekikupexupitagamaxo.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/doctors_note_for_work_word_template.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_off00011077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11077 6004 bytes
SHA-256: 2ce79c558d0fb278df8df06b1befdaa3b871656366ce5adc51cf29a672c1a054
font_01_sfnt_off000124ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EC 10720 bytes
SHA-256: 67f91ca7c864d8e42bbe8617c984d05fa48f69f6c4a3e16011c93a0cff9b4eb5

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