Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc6ca01633933c2…

MALICIOUS

PDF

77.6 KB Created: 2021-04-24 19:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fbed6f4dda4021ca2b5017c05b04e767 SHA-1: d0ba50cbe327f1e178c3ec7dfe806226edf64afd SHA-256: 5fc6ca01633933c205a9a013b837564fc04f6ca2576ac5686703349553634603
226 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or SEO manipulation scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://soxebez.ru/strik?utm_term=star+wars+books+series+ranked PDF link annotation
    • http://sifinujox.sportsontheweb.net/wafitakiwasikuwadibelek.pdfIn PDF document text
    • https://suxekupawuva.weebly.com/uploads/1/3/2/7/132710704/zarepojibebi.pdfIn PDF document text
    • https://kilazazemuvazu.weebly.com/uploads/1/3/1/4/131452741/66d11cc.pdfIn PDF document text
    • https://cdn.sqhk.co/sofizagumup/Br2ibE2/carrom_game_online_with_friends.pdfIn PDF document text
    • https://cdn.sqhk.co/renosopezare/jmFhgJk/gulexenogirogoke.pdfIn PDF document text
    • https://monokuzofo.weebly.com/uploads/1/3/2/7/132741222/1514838.pdfIn PDF document text
    • https://cdn.sqhk.co/jabisopomuxo/e1cMd1o/9132833753.pdfIn PDF document text
    • http://boost-shop.xyz/99552058222bzjvx.pdfIn macro / runtime command snippet
    • https://cdn.sqhk.co/musosesuguju/Ahdchd9/jaditeruvigixinamedipele.pdfIn macro / runtime command snippet
    • http://movawizaxaxato.mywebcommunity.org/duzimirukelatumim.pdfIn PDF document text
    • http://jesawukimefix.mypressonline.com/avelle_convatec.pdfIn PDF document text
    • http://pupigojoniru.mypressonline.com/58739654822.pdfIn PDF document text
    • http://fegokodelaxen.scienceontheweb.net/jack_and_the_beanstalk_the_real_story_full_movie.pdfIn PDF document text
    • https://kakowafalajoji.weebly.com/uploads/1/3/4/4/134455686/64cedb3.pdfIn PDF document text
    • http://spencermcman.us/exemple_dapprciation_de_stage_aide_soignanteg03mo.pdfIn PDF document text
    • https://cdn.sqhk.co/tosobulig/Rgdjgry/nasirusamek.pdfIn PDF document text
    • https://giboritozi.weebly.com/uploads/1/3/1/3/131379296/samojibafemave.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/vufuzewasi/11090859100.pdfIn PDF document text
    • http://tuparibuju.atwebpages.com/fourier_analysis_of_time_series.pdfIn macro / runtime command snippet
    • https://s3.amazonaws.com/rexogeguxosix/xagusu.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/xamovitoxadedepili.pdfIn PDF document text
    • http://vumamuv.myartsonline.com/what_is_the_average_monthly_income_for_a_family_of_5.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_off0000f267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF267 5184 bytes
SHA-256: a8932e17cf8822943a63f944b603f6d2dea5b234746118568b4eba669ddcf9ca
font_01_sfnt_off00010427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10427 11080 bytes
SHA-256: b4589cf6c42f0bc174a8a4bebcc09798758ba2295afd5ad05c76ec77b9d752b4