Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc6a35dc597ec1b…

MALICIOUS

PDF

77.6 KB Created: 2021-03-22 15:48:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 502b781729d16c15d56de06df0a17613 SHA-1: a8f5ea5df5edcd7b6b93f52272dc4d404ebec053 SHA-256: dcc6a35dc597ec1b69729e4f3dec730ab5c179f8cd4d7fe48ea6259059b3b2ee
194 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and detected as malicious by ClamAV and an ML classifier. The document contains numerous external links, including one to 'pelibifir.ru', suggesting it is designed to redirect users to potentially harmful websites. The presence of a 'download button' lure further supports a malicious intent to trick users into clicking through to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=bollyshare.+com+marathi+movie PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450244/normal_60044af1a4e27.pdfIn PDF document text
    • http://wipebodu.mypressonline.com/54898954240.pdfIn PDF document text
    • http://vizenam.medianewsonline.com/lisafu.pdfIn PDF document text
    • http://mazikopipovix.mywebcommunity.org/the_inferno_room.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458826/normal_5feb640b3f212.pdfIn PDF document text
    • http://rejorevubirobu.sportsontheweb.net/astrologia_vdica_dominic_de_lucia.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0524119b-9543-44d4-a9c1-6a2a85ae2681.filesusr.com/ugd/b12506_46895a4997e94ea584b93060d28d1324.pdf?index=trueIn PDF document text
    • http://xekabotiwuker.atwebpages.com/torafalov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9ebe09d-2c02-4b6e-ba4b-27bed2665c16/83753569077.pdfIn PDF document text
    • http://bopisumeku.atwebpages.com/98166154001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/719426a3-3854-4651-ab93-fa3fdf43139f/how_do_you_reset_a_nordictrack_ifit_treadmill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54449898-e9de-488d-ac27-2c2e946b3740/princeton_review_mcat_reddit.pdfIn PDF document text
    • http://fawikinego.myartsonline.com/sidemen_book_free.pdfIn PDF document text
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_7af2febd076a4270893e142f1a531056.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d4b5e83-bcf2-424a-b647-14c9ec39d56b/fimewebalerop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d673dc2-ad43-4964-aa13-3c6b329879eb/48718276409.pdfIn PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_ec820d48fa854e1185dbee9beda27dbb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa043951-2453-4653-8325-6c479db215cb/compare_and_contrast_two_physical_properties_of_apples_and_oranges.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e8bbda6-be98-4b04-85e6-83e696f1ebe5/calories_in_taco_bell_chicken_soft_taco.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99619fc2-1b4e-4321-bff7-a97d217facca/81344372356.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b3f659a-b2f1-497b-b26d-04b8da907fdf/sijezajuxafajezonedenamob.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_off0000f24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24E 5284 bytes
SHA-256: a3b0899da1304489ef235cf59609bb7ad5078a9f0fd6aa7d19f90b6a24ee728b
font_01_sfnt_off0001042b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042B 10824 bytes
SHA-256: ed781ce4247af7edddce72538ba1c39e4af4dac98bb23867e3c5653251e45d4c