Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2a525f25414cba…

MALICIOUS

PDF

70.4 KB Created: 2020-12-18 15:08:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 482cf9a085bd997c5e49738bfa134c6d SHA-1: 26e06f23baa63966fb04d8d8549cfe10fec197e7 SHA-256: 1b2a525f25414cba6f6d2a4b7db05598304ccb08d8463a18446a6f09414fa537
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links pointing to external PDF files hosted on various disposable domains, a common tactic for SEO link farms or phishing campaigns. One URL, 'https://ggtraff.ru/aws?utm_term=top+android+movie+apps+2019', is flagged as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ggtraff.ru/aws?utm_term=top+android+movie+apps+2019 In PDF document text
    • https://tesejusijup.weebly.com/uploads/1/3/4/7/134704228/jasefexig.pdfIn PDF document text
    • https://kimulidorifuvup.weebly.com/uploads/1/3/4/8/134856260/jatisubabowo.pdfIn PDF document text
    • https://nazaxefuv.weebly.com/uploads/1/3/4/5/134589683/zexoxaruniru.pdfIn PDF document text
    • https://sazojowob.weebly.com/uploads/1/3/4/3/134351878/4849d2e6500.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387571/normal_5f9bcd411e17c.pdfIn PDF document text
    • https://dawifibikinofi.weebly.com/uploads/1/3/4/6/134682228/3447028.pdfIn PDF document text
    • https://xikunamoveg.weebly.com/uploads/1/3/4/5/134596382/vinovu.pdfIn PDF document text
    • https://novafexoxola.weebly.com/uploads/1/3/4/4/134400343/8045598.pdfIn PDF document text
    • https://muvipedoboxeju.weebly.com/uploads/1/3/1/1/131163867/tuveso.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/70faf869-7ed2-4f84-855e-f10dc79fbe09/94518581900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e22a6b8d-7e09-4f02-b103-2454fd87f6ea/17015938884.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c5192d0-b9a3-4901-80ea-3e154bb40902/paul_in_philippines.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5d5cf7d0c8f249d62c5dd/t/5fd138241ae63e48415298cd/1607546916232/84814652008.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_off0000d7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C8 5564 bytes
SHA-256: 9f3131fad7ee207720a382e22386afc781e7e5f88ca6c557c78bcf185048c6d4
font_01_sfnt_off0000eaa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA5 10052 bytes
SHA-256: 174e9fa962f28ecae1856a96f109b5b3966f672a1346387e79484f53242f96b7

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