Malicious PDF — malware analysis report

Static analysis result for SHA-256 b871ed1bee788803…

MALICIOUS

PDF

76.3 KB Created: 2021-04-24 07:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7b68c06dfa3af69b7709e74ffe6f85aa SHA-1: d99ef510b0ad01690b0d57e1bd4002d091fd0366 SHA-256: b871ed1bee7888033b8bae9890a09c5eaa0c5a6a0ee7a3855cbd6dcbd278ebbc
226 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an MFA/2FA-themed lure. 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 0.9993

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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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=why+is+my+safe+not+opening PDF link annotation
    • https://cdn.sqhk.co/fujavuraleko/hdvjbji/the_live_score_app.pdfIn PDF document text
    • https://cdn.sqhk.co/xajevedu/djhhbjd/53352272467.pdfIn PDF document text
    • https://cdn.sqhk.co/pugirunosamo/lkiiTL7/pupifi.pdfIn PDF document text
    • https://cdn.sqhk.co/jepogedofuz/gjUONgh/pocket_bully_puppies_near_me.pdfIn PDF document text
    • https://wojaginobaxap.weebly.com/uploads/1/3/1/8/131857211/4f50610.pdfIn PDF document text
    • https://cdn.sqhk.co/takularozo/gnXjhhc/72966947985.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374956/normal_602778c229963.pdfIn PDF document text
    • https://cdn.sqhk.co/narivujuraf/jbgjvbT/jejosuvadovel.pdfIn PDF document text
    • https://cdn.sqhk.co/doxowite/Ogjhhbp/prison_jailbreak_11._3._1.pdfIn PDF document text
    • https://cdn.sqhk.co/talokelom/iigdl16/beast_quest_game_nintendo_switch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369511/normal_6060267b9be5d.pdfIn PDF document text
    • https://fanarise.weebly.com/uploads/1/3/4/3/134377412/wubaviriw_vupute.pdfIn PDF document text
    • https://vudizexifaret.weebly.com/uploads/1/3/4/3/134314381/nibakuziwoti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://poketiwuk.rf.gd/guruslodge_waec_answers_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/37222610835.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/the_mismeasure_of_man_book.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/whitfield_quest_pellet_stove_for_sale.pdfIn PDF document text
    • http://ropiviteginu.rf.gd/fuwosofaron.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/vufawazexeje.pdfIn PDF document text
    • http://sujetokotew.rf.gd/engineering_design_report_fsae.pdfIn PDF document text
    • http://rawifujit.epizy.com/finding_fish_summary_of_chapters.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/python_set_difference_between_two_arrays.pdfIn PDF document text
    • http://ratesedefavure.epizy.com/astm_a106_latest_edition.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_off0000ebe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE1 5304 bytes
SHA-256: 14c7f708854d08343ff5ccebeec13752a6156e23495884e9cb093fa4430e0ea5
font_01_sfnt_off0000fde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE4 11176 bytes
SHA-256: ced0f99ac584837f3d046b00d54d65b2d102b918a533ec66f40c2cbbe76f8c65