Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb6efb8205d3659…

MALICIOUS

PDF

78.0 KB Created: 2021-06-02 06:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e30030120e21521dbd869da7b74fd896 SHA-1: b6962b9020fb33fb8b074d653e0aa6bc45237f3c SHA-256: 5eb6efb8205d36592e0651e28bf1e51bca737bae35898779afbd799930bca295
226 Risk Score

Malware Insights

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

The sample is a PDF document that contains a lure related to Venmo payment notifications, aiming to trick users into clicking embedded links. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly indicates a phishing attempt. The presence of numerous external links, including one to 'krisoc.ru', suggests a redirection to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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://krisoc.ru/pbw?utm_term=what+happens+if+someone+doesn%2527t+accept+your+venmo+payment PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4409113/normal_60047fed2c58a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415065/normal_60325e134b27f.pdfIn PDF document text
    • https://zeberafuduzugag.weebly.com/uploads/1/3/2/6/132682167/11e7e5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418401/normal_6046912b66b67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367005/normal_5fd9f9153ba21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467318/normal_5ff1b715b7566.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425230/normal_6065df950f3ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471235/normal_606d0de879b4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367273/normal_603da99c33a15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450746/normal_5fe01f432998f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475208/normal_5ff5e0666176c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470040/normal_5fd78f57de816.pdfIn PDF document text
    • https://levazisibeguni.weebly.com/uploads/1/3/1/0/131070530/4837288.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470400/normal_6011c308118c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409255/normal_605f3bbe5f83b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pukagij.pbworks.com/w/file/fetch/144466977/cities_skylines_cheat_engine_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3837bb7c-c728-4b4e-a749-470d3c4d6672/how_to_reset_my_edimax_wifi_extender.pdfIn PDF document text
    • http://mukibilevejo.pbworks.com/f/bitlocker_recovery_password_viewer_tool_server_2008_r2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25557178-b31d-4bec-ab12-fe263b322139/72339045055.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41843c23-b5fd-4ba1-bd73-51f6169956b6/robinair_34700_manual.pdfIn PDF document text
    • http://naxenuve.pbworks.com/f/sandisk_memory_zone_app_installer.apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7af38eb0-a08d-4663-99d1-c91a997c66de/81952383583.pdfIn PDF document text
    • http://pezaloribed.pbworks.com/f/awd_system_malfunction_2wd_mode_engaged_toyota_sienna.pdfIn PDF document text
    • http://beratirupo.pbworks.com/f/nomesazumizuwajefitu.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_off0000eed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED4 5572 bytes
SHA-256: 3649e082df1c901bee5f01fd1f2216d201ebdaf238d88f65834dfd686b1304d2
font_01_sfnt_off000101bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BF 11960 bytes
SHA-256: e4e7cfb2652846860a0577d7722f7ee5d16eebaace6c8a20a11df2ec0381f4a1

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