Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb299d31a1484b8d…

MALICIOUS

PDF

74.2 KB Created: 2021-04-11 13:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ea53a05614da7065b17f604679cb3194 SHA-1: 88d33cb51fe871479b1c5e7e65ed83fec95d041e SHA-256: fb299d31a1484b8d3ed38ce4238b8b8172908060f7873e00bfe3e73f23e3d6bc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 numerous embedded URLs, many hosted on disposable domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains text related to a search query ('What compound is c6h6'), indicating a lure to trick users into clicking on malicious links.

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://jumiwimov.ru/strik?utm_term=what+compound+is+c6h6 PDF link annotation
    • http://faketikus.22web.org/wajenawoguzogepataxer.pdfIn PDF document text
    • http://gesemalisezusa.iblogger.org/54668737987.pdfIn PDF document text
    • https://cdn.sqhk.co/zudipoje/h2tVja9/best_doodle_halloween_costumes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403959/normal_60332125d4ecf.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/ie0jbhi/xiroxupuwij.pdfIn PDF document text
    • https://mabiredozex.weebly.com/uploads/1/3/4/4/134482212/xolenowojupaf.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvitatutuv/iigeOjd/64488140359.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478961/normal_5fd08040ca97a.pdfIn PDF document text
    • https://dubilovatigalis.weebly.com/uploads/1/3/4/7/134701517/pagewuwazetusiz.pdfIn PDF document text
    • https://cdn.sqhk.co/teketerep/c0jd0gj/99247527618.pdfIn PDF document text
    • https://lozoveku.weebly.com/uploads/1/3/1/4/131438804/wojuba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rojepubaxogo.epizy.com/40600466898.pdfIn PDF document text
    • http://tetasafireras.rf.gd/arabic_audio_books.pdfIn PDF document text
    • http://guwupurog.epizy.com/muxepafer.pdfIn PDF document text
    • http://wizugujolapalel.epizy.com/postpartum_hemorrhage_pathophysiology.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/hp_deskjet_2542_change_ink_cartridge.pdfIn PDF document text
    • http://lekaleramitogal.rf.gd/lodibujumatev.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/chupke_chupke_gana.pdfIn PDF document text
    • http://wifobujaxude.epizy.com/bejunugasuvulenereju.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/where_do_i_find_my_hidden_photos_on_instagram.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_off0000e5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B1 5352 bytes
SHA-256: 19b06d61409c4711f2e8f15f92d1ececf40a66157d0e5a77f5d59bfc90220992
font_01_sfnt_off0000f7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C9 10396 bytes
SHA-256: 9796c54b5a0bb918d3f1fad88b0cfda82e067f276e066ec5e92d3dbccacce251

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