Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e135297776854d…

MALICIOUS

PDF

90.5 KB Created: 2021-04-02 23:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 642bf971fdfef89bad89424702c65ad4 SHA-1: cd0baf60241adec51a0ed67935aa90e70a8d9db7 SHA-256: 91e135297776854d276267691a8a3ea2fc03a5f140efb25ac3f6b350b9ad7992
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with several pointing to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the PDF structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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.
  • 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://dugedepap.ru/strik?utm_term=72+nombres+de+dios+en+hebreo+pdf PDF link annotation
    • http://sabovibin.medianewsonline.com/hpv_e_cancer_de_colo_uterino.pdfIn PDF document text
    • http://wssummer.space/77522860952veqln.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/how_much_does_it_cost_to_replace_a_catalytic_converter_toyota.pdfIn PDF document text
    • http://wobafobigo.mywebcommunity.org/how_much_does_it_cost_per_day_to_run_a_dehumidifier.pdfIn PDF document text
    • http://xrootunited.com/best_criminal_lawyers_near_meoar82.pdfIn PDF document text
    • https://safapovajedetux.weebly.com/uploads/1/3/4/6/134642125/xajajadavuguzoxo.pdfIn PDF document text
    • http://jefevivavifax.scienceontheweb.net/angielski_wiczenia_gramatyczne.pdfIn PDF document text
    • https://nexirexosevexos.weebly.com/uploads/1/3/4/5/134500935/8953080.pdfIn PDF document text
    • http://tegor.xyz/20928026038gmzme.pdfIn PDF document text
    • http://apsdd54gfv.xyz/dubelaxisefobtb2go.pdfIn PDF document text
    • https://diniporugixufov.weebly.com/uploads/1/3/1/8/131856235/sosiluwezawosoregi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jozilaro.atwebpages.com/physical_description_vocabulary.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/aycliffe_village_primary_school_ofsted_report.pdfIn PDF document text
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_ae343a6ea712404ca852be8eb730c25f.pdf?index=trueIn PDF document text
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_803162f8e8fd4400b45d364b456abc2c.pdf?index=trueIn PDF document text
    • http://zefuxaninegug.epizy.com/chrome_helper_not_working.pdfIn PDF document text
    • https://da9d63b4-fbfd-4f6f-88e7-06ac0d76355b.filesusr.com/ugd/ca300b_72399a82555a4e3c890bbe755fd869f3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jifesu/apache_tomcat_8._0.pdfIn PDF document text
    • http://dogirajuwuxo.epizy.com/57761133922.pdfIn PDF document text
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_aa8f362b36634b709ce8181eaa3b693a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/monster_illuminessence_led_strip_review.pdfIn PDF document text
    • https://488a161d-122f-4e25-b35e-34d1d0e27b34.filesusr.com/ugd/bbc910_2dc902a70bd943a5a1d2454c49537aa9.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E81 5004 bytes
SHA-256: dc8efce251c75c34488fac645861d1cb2a9fda5cda36ce0646594edb957c0b73
font_01_sfnt_off00011f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F42 14864 bytes
SHA-256: e5a244c3cb7583f7437464b5e3ece955076954d9fcd601a40471a30dc2612c6d
font_02_sfnt_off00014e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E8E 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3