Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf15eeab31bb1fe6…

MALICIOUS

PDF

74.6 KB Created: 2021-02-07 10:57:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 1aea2ebbe5356801a42a45d7253d7f34 SHA-1: cdac8ef9c3548b381b81e5f36508e165d9f17e43 SHA-256: cf15eeab31bb1fe6b30555dcb3de8aa331c94d3ed937c913c8333c77894ddc41
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a deliberate structure for hosting many links on disposable domains. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via the linked sites. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/wb?keyword=southampton%20fc%20fixtures PDF link annotation
    • http://snatural.space/tanosevebitiromnegd7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496404/normal_5ffe6498cd8e8.pdfIn PDF document text
    • https://vowipolijej.weebly.com/uploads/1/3/4/7/134713390/4177438.pdfIn PDF document text
    • http://spoonnumberone.xyz/86045556134reqg3.pdfIn PDF document text
    • https://wudajelenap.weebly.com/uploads/1/3/4/4/134470879/941c27e.pdfIn PDF document text
    • http://avbox.org/62406302602klksg.pdfIn PDF document text
    • https://rizenuwav.weebly.com/uploads/1/3/4/3/134335920/2313585.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382965/normal_6004b81e3323c.pdfIn PDF document text
    • http://easy-money-cash.space/zofamimegivuzed13k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372104/normal_5fd8d67d760ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470400/normal_5ff75be901010.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386091/normal_6013138174fb3.pdfIn PDF document text
    • https://robesiladobaluj.weebly.com/uploads/1/3/0/8/130813577/c833524b6a86238.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://nelodetasa.rf.gd/16635571002.pdfIn PDF document text
    • http://bokakemipik.epizy.com/number_hunt_worksheets_11-_20.pdfIn PDF document text
    • http://nutujetis.rf.gd/68634981422.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84C 5276 bytes
SHA-256: da86afb365c594772f42dbb4253dcf39a737ff7e9de83d54b861abb237d89755
font_01_sfnt_off0000ea19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA19 11008 bytes
SHA-256: 0979e89c4334ad49e3ac091b97cd9ce686534d6d0b790e1943e74552e2a7c3f8
font_02_sfnt_off00010ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECE 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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