Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4bebd46cb139e95…

MALICIOUS

PDF

94.6 KB Created: 2021-02-17 08:15:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 001d3afdd691f7a11fa1694f4fa5645c SHA-1: d2620f09cb263b07e4c0dda8d23027dc48410ae6 SHA-256: c4bebd46cb139e95a7a6e69018c0ec2280460a317c6653b07cc5b8c6be8f2088
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable hosting or link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, appears to contain keywords related to product reviews, likely as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=husky+26+gallon+air+compressor+review PDF link annotation
    • https://jawifeguviweti.weebly.com/uploads/1/3/2/3/132302916/kesinukukusag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379487/normal_600daed4c5aee.pdfIn PDF document text
    • https://vubeluzuge.weebly.com/uploads/1/3/4/3/134357782/rarokumatemon.pdfIn PDF document text
    • http://japadalifu.22web.org/arrayed_waveguide_grating_review.pdfIn PDF document text
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/farip-namawisis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482863/normal_60120bf15154f.pdfIn PDF document text
    • https://wifuduwelu.weebly.com/uploads/1/3/2/8/132814355/gagupoluvofipu_damupu_zewovotitupen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506131/normal_6020768e6c14d.pdfIn PDF document text
    • http://trafikcezaodebayisi.com/gelofizimj3vw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499351/normal_5fee0b4b4cea7.pdfIn PDF document text
    • https://jetovalanowu.weebly.com/uploads/1/3/0/7/130739462/vidudijadijaxuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kozafulide.rf.gd/whirlpool_washing_machine_parts_price_list_in_india.pdfIn PDF document text
    • http://lepamiruketujuf.epizy.com/suxeb.pdfIn PDF document text
    • http://muloluj.rf.gd/downers_grove_north_high_school_report_card.pdfIn PDF document text
    • http://dadodoserosif.epizy.com/how_to_set_fresh_brew_timer_on_mr_coffee.pdfIn PDF document text
    • http://zunaxixe.rf.gd/82348844073.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001307f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307F 5820 bytes
SHA-256: a96dc40d23ff0cf1f835f863130e516d9adb730f182525d594d354f37dd408db
font_01_sfnt_off0001445a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1445A 12320 bytes
SHA-256: f787f6c6261d7dc6efc2e71d7f50231706406ca62a8bfa69b4fc21bb1d002e5e

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