Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9dc09017db1c942…

MALICIOUS

PDF

74.8 KB Created: 2021-02-23 09:10:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f09449178e73aa3116fc3101793c39e5 SHA-1: 39fa6e70a9ad63b9414a17446ac91279f7070f73 SHA-256: a9dc09017db1c942d7632f512509cc8c580ca086ca55d311cb2ce05c778a422c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, appears to be a lure related to "themes of art", likely to attract unsuspecting users to malicious sites.

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
  • 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://jottigo.ru/strik?utm_term=what+are+themes+of+art PDF link annotation
    • https://divakifemomo.weebly.com/uploads/1/3/5/3/135311574/pidokur.pdfIn PDF document text
    • https://jodowofimen.weebly.com/uploads/1/3/5/3/135330599/8118393.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvisisitinu/qifhige/37700278580.pdfIn PDF document text
    • https://matexofetuboso.weebly.com/uploads/1/3/1/4/131453592/zidav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455901/normal_5fe921ec46d05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368750/normal_60186b8545893.pdfIn PDF document text
    • https://zibamikalizofu.weebly.com/uploads/1/3/1/4/131409526/5034183.pdfIn PDF document text
    • http://wefinexof.iblogger.org/bosch_serie_4_tumble_dryer_user_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458838/normal_5fc98c16bd5fa.pdfIn PDF document text
    • http://jowopejev.22web.org/wuwigevavut.pdfIn PDF document text
    • https://buzufurabobozu.weebly.com/uploads/1/3/5/3/135304208/pemifupal.pdfIn PDF document text
    • http://zelenege.iblogger.org/xozewewikobexi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486054/normal_602fbe4cf2dc0.pdfIn PDF document text
    • https://kufudazasa.weebly.com/uploads/1/3/4/6/134626120/d9717.pdfIn PDF document text
    • https://cdn.sqhk.co/vasozaponem/bgijje0/logitech_steering_wheel_setup_for_xbox_one.pdfIn PDF document text
    • https://pezibufanijazox.weebly.com/uploads/1/3/4/6/134639202/3f8fc6175e.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AA 4988 bytes
SHA-256: d6b2a0468e16ba72bddd62621e9a341128f4dedb3f6798896d1fb64d90d816ea
font_01_sfnt_off0000fa81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA81 10504 bytes
SHA-256: 87436dee40dbc8a99d04d1988137061eea433335838eed1ab5a13f76b84dc37f

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