Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b7fe1ad951815a5…

MALICIOUS

PDF

76.5 KB Created: 2021-03-05 03:34:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: feda5cfceb705736ba22a7dad20dfb5b SHA-1: b1d53d4aec72d6c8b8e2ffb8c63990f74e0e920e SHA-256: 7b7fe1ad951815a5b6797a8f10c8c7d9b6e61b665f1f0651bebb5a94795031f9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to drive traffic to malicious sites. The primary malicious URL identified is lozipotod.ru, which is likely used to distribute further payloads or engage in phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/award?keyword=cognitive+behavioral+treatment+of+borderline+personality+disorder+marsha+linehan+pdf PDF link annotation
    • https://sipesavuw.weebly.com/uploads/1/3/4/6/134697333/zoxomilubosiki.pdfIn PDF document text
    • https://wojaxesisitofem.weebly.com/uploads/1/3/4/7/134717171/8122811.pdfIn PDF document text
    • http://lunagogafoxoj.sportsontheweb.net/reziwujuwipusezomamoj.pdfIn PDF document text
    • http://betizekaxu.getenjoyment.net/4543479610.pdfIn PDF document text
    • http://mizizufiku.mywebcommunity.org/ematic_at103b_digital_converter_box_troubleshooting.pdfIn PDF document text
    • https://lureriwoxefewu.weebly.com/uploads/1/3/4/5/134590368/kesupebekot-nijazaziti-mipaki-tuvowof.pdfIn PDF document text
    • http://balegetiwep.mywebcommunity.org/anet_a8_3d_printer_cura_settings.pdfIn PDF document text
    • http://nonowun.mywebcommunity.org/7985473714.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdd68d7d-4f45-45d6-af20-513f321963fa/59495910719.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d720a199-94bd-4c8c-81ae-70f9ac938d9b/35117825385.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/82878921469.pdfIn PDF document text
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_472099c5fbae4e18ba8a88cefcbb45e7.pdf?index=trueIn PDF document text
    • https://e5b7f393-9b83-42c5-a877-5b85c0c772c8.filesusr.com/ugd/77b42d_4017949c5b6044c9a05229606b255af1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b77d1806-6c32-4936-912d-0de0e475e860/25725255928.pdfIn PDF document text
    • https://0ea28b16-58c2-472d-b6be-3e97fe9b7bb6.filesusr.com/ugd/696b8a_b8d07fdfc87b488c8ee4e5c27b514b74.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bdb9900-a0a6-4bcd-8e25-0a70201b1d85/little_shop_of_horrors_2019_cast_recording.pdfIn PDF document text
    • http://duxegejuw.atwebpages.com/11110899244.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/netbeans_8._1_64_bit.pdfIn PDF document text
    • http://futakanawus.onlinewebshop.net/davuluwuta.pdfIn PDF document text
    • http://kusababi.onlinewebshop.net/gopelasinekitirokepo.pdfIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_74421551f1e34d9da97e9766900796a5.pdf?index=trueIn PDF document text
    • http://benamow.myartsonline.com/how_to_play_hand_drums_for_beginners.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_off0000ec1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1F 5664 bytes
SHA-256: f52fdc4b46f5a30f93618458c55e8ed58528e28a6f6857c6c67263a9fc7467ba
font_01_sfnt_off0000ff44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF44 10640 bytes
SHA-256: 87d609fe7d2bd0309f95b1ef44007bda9fe7da4d5038975ce9e6fa2ae353e641