Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc5d51c2ed31dfa…

MALICIOUS

PDF

87.0 KB Created: 2021-04-16 02:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 88d3f7c3a54cef0f4c18aac4413e364d SHA-1: fa2efcee1a2a0321ae810c18feb1ceac8ce7dbf4 SHA-256: bfc5d51c2ed31dfa9a24dc2dbe654f3902e9effb94b0219f7d2de3622d8b8144
246 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses brand-impersonation credential phishing. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://kubimivigiv.weebly.com/uploads/1/3/4/3/134314132/mokaritevirave.pdf.
  • 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://dafemum.ru/strik?utm_term=how+to+set+call+forwarding+in+samsung+a30 PDF link annotation
    • https://kubimivigiv.weebly.com/uploads/1/3/4/3/134314132/mokaritevirave.pdfIn PDF document text
    • https://popuvagilubasi.weebly.com/uploads/1/3/4/0/134018524/vugigovifore.pdfIn PDF document text
    • https://cdn.sqhk.co/sadetujadufi/hhhjcbW/92295727359.pdfIn PDF document text
    • http://gizovivomiz.getenjoyment.net/57990101866.pdfIn PDF document text
    • http://mikovil.mywebcommunity.org/72260572516.pdfIn PDF document text
    • https://wupuvogobed.weebly.com/uploads/1/3/4/5/134507139/2405954.pdfIn PDF document text
    • https://cdn.sqhk.co/sidogorego/eiieidW/irancell_man_login.pdfIn PDF document text
    • https://cdn.sqhk.co/livukigelo/d76arUF/battle_city_2_players_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gigepiwej/hexiekN/bubulureta.pdfIn PDF document text
    • http://pedugubugof.mywebcommunity.org/zovonawuwa.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/tmata_bakalskch_prac_upol.pdfIn PDF document text
    • https://pagurewitapusak.weebly.com/uploads/1/3/4/6/134632053/zalakibomuxupiza.pdfIn PDF document text
    • http://sejujanovemo.medianewsonline.com/59895867508.pdfIn PDF document text
    • https://wilowukodol.weebly.com/uploads/1/3/4/8/134881933/kowaxifewe_kibowoditufor.pdfIn PDF document text
    • https://cdn.sqhk.co/nasubivapu/gihivif/virtual_music_mixer_dj_pro_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/jjgcjiX/bluestacks_hd_app_player.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/9cjLyh7/68850131629.pdfIn PDF document text
    • https://cdn.sqhk.co/piwoputi/ughid37/64883095285.pdfIn PDF document text
    • https://sizeduxaginota.weebly.com/uploads/1/3/2/7/132712537/mumusimafove.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/davawina/suvejujonax.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/3833928935.pdfIn PDF document text
    • https://s3.amazonaws.com/filidabut/1999_dodge_dakota_transmission_identification.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_off000113c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C3 5700 bytes
SHA-256: 9158aeb5282d06a814d481f810c4b5f4d117b9fff4f0117e1142c51b890c82e2
font_01_sfnt_off00012723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12723 11592 bytes
SHA-256: 7d8310902a157b85a596dc5d3823b16e6d419588022163146b68f78bccc7848a

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