Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df684ec6a000fea…

MALICIOUS

PDF

79.2 KB Created: 2020-12-30 03:31:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 18ea8582afa5914c4c97a2884a49f4d2 SHA-1: bad29074c5c4aad911488dc7d64c2eff96de127b SHA-256: 8df684ec6a000fea773c726a31520cf7be70c4c862c24f17ed19f12893a49827
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure suggests it is designed to lure users into clicking links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://traffine.ru/123?utm_term=apartments+for+rent+no+background+check+chicago In PDF document text
    • https://cdn-cms.f-static.net/uploads/4485443/normal_5fbefb34ee455.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490272/normal_5fe3a60de2140.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/pewega_nejox_nutusotovifi.pdfIn PDF document text
    • https://babotiditufo.weebly.com/uploads/1/3/4/6/134694550/4368066.pdfIn PDF document text
    • https://movulejovem.weebly.com/uploads/1/3/4/4/134470355/1762c.pdfIn PDF document text
    • https://porujigiwafixuf.weebly.com/uploads/1/3/4/3/134373975/6a7b2.pdfIn PDF document text
    • https://fabupegux.weebly.com/uploads/1/3/4/6/134689396/e9dc47caa.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/87407c58-bad6-4bff-9427-f102b1361da2/herramientas_manuales.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae61b06d-3610-4d08-bd25-51b892c56a6f/identifying_types_of_numbers_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78ea5880-454c-4891-ba41-8e89955c327d/black_swan_meaning_bts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acc6b5bc-bb16-4e2b-9398-bd9f594f4d82/60450703494.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa39f851-eb71-4b75-a493-bff758424d66/starbucks_barista_trainer_guide.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_off0000f72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72B 5732 bytes
SHA-256: b4455de8a8abca5be17a0b2fda03e3151c38f5f620f17eb779681fec7b24609e
font_01_sfnt_off00010a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A81 10960 bytes
SHA-256: 5bd6ed979ea5e931c2e48bef4ec9444811a83546eaf9d16da7ec2e51315d790e

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