Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff72eedb5172066…

MALICIOUS

PDF

69.9 KB Created: 2021-06-01 10:27:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 980755ba90d77a7631dde5e2572d14fb SHA-1: 192b3250b3ba2a3dd28598e82d25df6fb4e76724 SHA-256: 0ff72eedb5172066b4ce58b38b8c83741e48f3f0313e666db0bb24ad835cc266
156 Risk Score

Malware Insights

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

This PDF file is classified as malicious, exhibiting characteristics of a phishing attempt by masquerading as a Sony Vaio recovery key. It contains a large number of external links, many pointing to PDF files hosted on link farm sites, which is a common tactic for distributing malware or directing users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/pbw?utm_term=sony+vaio+e+series+windows+7+recovery+key
    • https://jomopejizudo.weebly.com/uploads/1/3/4/6/134664487/vibijagekejakis-kimigowizaset-zavafumotim.pdf
    • https://cdn-cms.f-static.net/uploads/4366956/normal_60571053b9fd6.pdf
    • https://lebilelumebik.weebly.com/uploads/1/3/1/6/131636833/586c8.pdf
    • https://sujufejunuvevu.weebly.com/uploads/1/3/2/8/132814923/1334874.pdf
    • https://cdn-cms.f-static.net/uploads/4385038/normal_605c3f139b228.pdf
    • https://tobejisexin.weebly.com/uploads/1/3/1/4/131454505/2f6b8e5c1f1a66d.pdf
    • https://cdn-cms.f-static.net/uploads/4454052/normal_601c65082ec45.pdf
    • https://xuzijobozu.weebly.com/uploads/1/3/1/4/131411245/gajejekibepigit-pufedikere-tajebes-wakedakutawutig.pdf
    • https://cdn-cms.f-static.net/uploads/4489713/normal_606e3198154ea.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kapetipubi.pbworks.com/w/file/fetch/144426117/14097614846.pdf
    • http://zopujoxobug.pbworks.com/w/file/fetch/144411483/76558110092.pdf
    • http://zilebunod.pbworks.com/f/how_to_attach_swiffer_wet_jet_pads.pdf
    • http://ziduzobif.pbworks.com/w/file/fetch/144437097/guitar_tab_pro.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d381.bin
cdef5f0520205d8f70175f3a4a193b77bbae056908cf79f5a569b0ade3607601
pdf-font-stream PDF embedded font (sfnt) at offset 0xD381 5404 bytes
font_01_sfnt_off0000e618.bin
1f07bccfe4586ac717e9bdaa480370163cb8244c412125ef62b84075a899d731
pdf-font-stream PDF embedded font (sfnt) at offset 0xE618 10800 bytes