Malicious PDF — malware analysis report

Static analysis result for SHA-256 feb518a30cb4dd51…

MALICIOUS

PDF

81.8 KB Created: 2021-02-18 03:50:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 000933680112856c87df79c870f59821 SHA-1: 2779ce9e8fc676a1fae91927c51cfbb930b27a4c SHA-256: feb518a30cb4dd515e4a4077e197373def05ed70c2d833003457001ee914b8f7
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata that might be used to disguise the true nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/aws?utm_term=sandisk+sansa+fuze+plus+manual PDF link annotation
    • https://cdn.sqhk.co/kosenopelid/c6sjgf5/nail_biting_deterrent_walgreens.pdfIn PDF document text
    • http://sarkife.site/gojenajukunuvasapefeto58bn.pdfIn PDF document text
    • http://naturfresh.fun/kogupewalefutoseredumirabvitr8.pdfIn PDF document text
    • https://cdn.sqhk.co/totimujid/cihVibC/ninja_run_adventure_mod_apk_android_1.pdfIn PDF document text
    • https://falatunasozenu.weebly.com/uploads/1/3/4/7/134762474/kunanuz.pdfIn PDF document text
    • https://rejileju.weebly.com/uploads/1/3/4/3/134335231/dowuxozakuzawu.pdfIn PDF document text
    • https://mevinabepoke.weebly.com/uploads/1/3/2/7/132740553/96c19a.pdfIn PDF document text
    • http://luminar3-download.xyz/887161728670lpnc.pdfIn PDF document text
    • http://latencfsrt.space/anthem_bcbs_medicaid_prior_auth_formpa41s.pdfIn PDF document text
    • http://store50off.info/b._o._t._a._tarot_deck87h3k.pdfIn PDF document text
    • https://sigesibum.weebly.com/uploads/1/3/1/4/131438142/4916987.pdfIn PDF document text
    • http://grusha.space/6802317211fi7at.pdfIn PDF document text
    • http://bristol-yalta.run/irony_worksheets_for_high_schooliyckj.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_off0000fe27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE27 5308 bytes
SHA-256: 43807b167473d55c3f0cb5e3bc5f672555c3c1a2446eecd91c9985468ea2f96f
font_01_sfnt_off00011038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11038 12428 bytes
SHA-256: 1dcfa08959c4302ec356c8bce64899f3bfd548e73052338059e2a95bc724e2db

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