Malicious PDF — malware analysis report

Static analysis result for SHA-256 f83cc80ead5ba772…

MALICIOUS

PDF

78.2 KB Created: 2020-12-03 11:43:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d318111d2d8a1b683992cba14100ab6e SHA-1: 172ed7983f9d9bc0830b18886f19cd65ead7088a SHA-256: f83cc80ead5ba772904c98be345e58c1dde5d5405dc0b83692e0dcf3a33e3073
284 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting and redirector infrastructure, indicating a link farm designed to distribute malicious content. The heuristic 'SE_PAYMENT_REDIRECT_LURE' suggests a business-email-compromise pattern, likely aiming to trick users into initiating fraudulent transactions. The presence of ClamAV detection and ML classification further supports its malicious nature.

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
  • 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.
  • 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.
  • 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://ggtraff.ru/strik?utm_term=arc%2527teryx+camosun+parka+australia In PDF document text
    • https://static.s123-cdn-static.com/uploads/4443608/normal_5fc3e44f7a364.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/jepawilo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488807/normal_5fb4408086cea.pdfIn PDF document text
    • https://mimevomakiket.weebly.com/uploads/1/3/4/6/134693464/01488baf2ac.pdfIn PDF document text
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/79a6de99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383800/normal_5faeb4b89baa3.pdfIn PDF document text
    • https://kivofijola.weebly.com/uploads/1/3/4/3/134309380/muzizok.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/3eb27812-b7e6-4760-9a1d-fb4c31fb769e/ffa_symbol_svg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e44913b-239a-4fd8-b29d-539c8e09c639/7001848343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17d1858d-f430-4387-a229-5f9f9b5a45c4/54032621099.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cafc2d3-ca9c-4a8c-be85-36040230dc84/kipeliluzo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc385e368612547ed6e891e/t/5fc61c933485235c8697b985/1606818964285/drop_it_low_ester_dean_download.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_off0000f35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35B 5336 bytes
SHA-256: b1dc6d4b16cf476caa6ea14e924f4bc8952e17cdd4e4d5f85af0ee269736e247
font_01_sfnt_off00010583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10583 11444 bytes
SHA-256: ffbd5f95079cb1bd226c422c59c90b741ea7fedcca63557d2cea18d7e675e228

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