Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27cde26c38cef3b…

MALICIOUS

PDF

72.1 KB Created: 2021-02-09 04:35:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 78a48ee051ab2f95ed7c8d7a798c4017 SHA-1: 4a23b6132c8d9e55e4c932de6d6da90d26a5fb2e SHA-256: d27cde26c38cef3b73102b39ffb2e1ba47ea5b07960f635d0fe0db0009659a0a
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains or link farms, indicating a phishing or credential harvesting attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the overall structure point towards a lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://bologen.ru/aws?utm_term=credit+report+singapore+cost PDF link annotation
    • https://cdn.sqhk.co/nozesinipi/qLbE9je/62097550523.pdfIn PDF document text
    • https://mutakisutuw.weebly.com/uploads/1/3/4/7/134768563/9877636.pdfIn PDF document text
    • https://cdn.sqhk.co/jefapukawore/jgDibh9/bolefonimurisozikifupekas.pdfIn PDF document text
    • https://cdn.sqhk.co/wozepefiga/dFigia0/43797958113.pdfIn PDF document text
    • http://mangalvpodarok.ru/54001307114bdre7.pdfIn PDF document text
    • https://cdn.sqhk.co/zewezerezi/IsyLic2/arknights_tier_list_june_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/kagaxavog/hq8yHfE/67457258066.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/hauL1Vx/risuginodopimafu.pdfIn PDF document text
    • http://itagreen.fun/75722060125jo5ri.pdfIn PDF document text
    • https://tafibukazun.weebly.com/uploads/1/3/5/4/135400045/rolexesilul_vizized.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451930/normal_5ff5f0780db16.pdfIn PDF document text
    • https://pukogapuwobar.weebly.com/uploads/1/3/4/3/134307851/755266.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413225/normal_601b52e5213a1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD76 5116 bytes
SHA-256: 547fe5d36002a5a490a75f163e6674cd7c24c74e8388eaa70690da694e112b46
font_01_sfnt_off0000eee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE5 10888 bytes
SHA-256: f88f84e27ca49733e552ad33b67778ba92e9688dac5eb28bbe19176110613cf0

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