Malicious PDF — malware analysis report

Static analysis result for SHA-256 405cdf796edcd33a…

MALICIOUS

PDF

75.8 KB Created: 2021-05-30 13:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 85ab5a2d83421ad241f79caefc95c0f9 SHA-1: 040f55e8e5c646a086f72bbb86eb65a9f46b8f44 SHA-256: 405cdf796edcd33a34f98eb2e4318efe9e615ac9f0be244ef2cfb308f104b817
264 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous external PDF links, including one pointing to a known malicious redirector at 'https://yafferge.ru/123?utm_term=interactive+brokers+group+annual+report'. The document also exhibits characteristics of a callback phishing lure, suggesting it may be used to trick users into calling fraudulent support numbers. No scripts were extracted, but the presence of embedded URLs and the link farm structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://yafferge.ru/123?utm_term=interactive+brokers+group+annual+report In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403264/normal_6050388f436a4.pdfIn PDF document text
    • https://pokuzasovud.weebly.com/uploads/1/3/4/1/134108684/witiweb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462992/normal_60567ed7b3fa8.pdfIn PDF document text
    • https://doxipawuno.weebly.com/uploads/1/3/2/6/132682924/vedezokevu.pdfIn PDF document text
    • https://zavebunerug.weebly.com/uploads/1/3/4/3/134358754/xenofuzefari.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413842/normal_603fa47f63878.pdfIn PDF document text
    • https://bigeriburaline.weebly.com/uploads/1/3/4/3/134334921/5411895.pdfIn PDF document text
    • https://fovivijidilel.weebly.com/uploads/1/3/4/8/134888041/c055b842456b8b7.pdfIn PDF document text
    • https://xovesoxak.weebly.com/uploads/1/3/0/8/130813458/xisobamibavi.pdfIn PDF document text
    • https://jumuwubugunitus.weebly.com/uploads/1/3/1/0/131070493/6301354.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/36306761-ce43-430c-989c-da1e727700c6/blockchain_development_with_python.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07441f06-97f1-4abe-afe7-09ea896524fb/kodikudotevibimalunuku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf6252e2-7896-4c27-96e6-88e870797e51/how_to_use_scansnap_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b0c2c88-5b79-42d3-a74a-af9627545d06/the_devil_wears_prada_watch_online_putlockers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81bf7e0c-5206-4499-83f4-ac713263e0a4/2014_harley_davidson_sportster_883_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f19f1f39-5a13-4133-922d-79ddfbf59a61/82844435316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90baac0f-d91d-4220-8627-b143d4897f4b/is_there_a_reset_button_on_my_keurig_2.0.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c9c2779-7ff6-4bcb-87d8-210448e0eeb9/brother_hl-2270dw_drum_error_reset.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_off0000ea6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6F 5304 bytes
SHA-256: e1b99e1a01e5aa676fc5a6bae18a7a7966a38f102d00985a1c73698e7d332533
font_01_sfnt_off0000fc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC90 11068 bytes
SHA-256: 9e0d17dbd562462a2375a5f41b63bf0eca9b988e6ba1acfa2013483ca5dba9b9

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