Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f11a43b256ff98b…

MALICIOUS

PDF

79.2 KB Created: 2021-05-29 03:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d0e75e2bf9250c8896ba0fb6c2a10ea9 SHA-1: 795bf11332253adb81d00f947736d8537d076bef SHA-256: 5f11a43b256ff98bb6dee4f9f26ad0304a7ef866e46160868cf25bdf45ce1b84
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded content and URLs, such as 'how do i reset my toyota odometer', are designed to trick users into clicking through to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://soxebez.ru/strik?utm_term=how+do+i+reset+my+toyota+odometer PDF link annotation
    • https://tidekomix.weebly.com/uploads/1/3/4/4/134441433/e1974da0dd1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375514/normal_5ffc798c3a496.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417999/normal_6031401c317b9.pdfIn PDF document text
    • https://fusutazewemeben.weebly.com/uploads/1/3/5/9/135976358/sorileruxubi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454803/normal_5fdbffd919821.pdfIn PDF document text
    • https://zopogunonezaso.weebly.com/uploads/1/3/1/6/131637395/375252.pdfIn PDF document text
    • https://mitemulesebiped.weebly.com/uploads/1/3/4/4/134479511/8a2c53d293cbd.pdfIn PDF document text
    • https://xafosaxit.weebly.com/uploads/1/3/1/8/131859261/motoriboxozi.pdfIn PDF document text
    • https://wezoduvum.weebly.com/uploads/1/3/4/0/134096245/9620464.pdfIn PDF document text
    • https://nupazafusida.weebly.com/uploads/1/3/7/5/137512774/5f31f948f86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456398/normal_603e73c0d446c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454988/normal_6052771e7e656.pdfIn PDF document text
    • https://kagamufoxigog.weebly.com/uploads/1/3/4/0/134013308/fibelelu.pdfIn PDF document text
    • https://kexazupaxi.weebly.com/uploads/1/3/3/9/133997339/xapikisutajomog.pdfIn PDF document text
    • https://nefalitarula.weebly.com/uploads/1/3/4/3/134308949/3683401f75.pdfIn PDF document text
    • https://gojudewusidaza.weebly.com/uploads/1/3/4/8/134888042/zuroju_dubidowu_kitomam.pdfIn PDF document text
    • https://jirakevajiw.weebly.com/uploads/1/3/5/9/135966085/rubasagopaj-sunebu-zagut-dadawoxuref.pdfIn PDF document text
    • https://lerorenoj.weebly.com/uploads/1/3/5/3/135390996/9570122.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/difakaxulevixup_migolotusawef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415081/normal_60385c43b36fe.pdfIn PDF document text
    • https://jumaredutidab.weebly.com/uploads/1/3/4/3/134310232/boxapixemapunava.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC41 4776 bytes
SHA-256: f1e8a67fc9760456b5ef3e8b4863584684a86d15fac965f5bf1529e2b17ef13d
font_01_sfnt_off0000fc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8E 10748 bytes
SHA-256: b8266e1493f55798f58a403edc754d25be0bf3fa0291ef1314799658294c5a3e
font_02_sfnt_off0001210d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210D 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361