Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef751c6226b68047…

MALICIOUS

PDF

74.2 KB Created: 2021-01-21 03:15:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4745f2c3e6d03619a1f79ac7c8d28adf SHA-1: 9795b81ff371a8bab81820f1588a2176a87725bc SHA-256: ef751c6226b6804784986174f44ddd939f7c1169539d2b1308471a1618cbc2b8
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 detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text that could be interpreted as a lure. No scripts were extracted, but the presence of external URIs and the overall structure point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/aws?utm_term=complex+migraine+news+reporter PDF link annotation
    • https://cdn.sqhk.co/nejajevafode/hhjidoD/dusupeto.pdfIn PDF document text
    • https://site-1173612.mozfiles.com/files/1173612/the_whip_dance_1940.pdfIn PDF document text
    • https://site-1176697.mozfiles.com/files/1176697/76686064069.pdfIn PDF document text
    • https://site-1175201.mozfiles.com/files/1175201/bajrangi_bhaijaan_all_song_pagalworld__io.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465010/normal_6008d1e5b2665.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/icoQmha/zarezutedazax.pdfIn PDF document text
    • https://site-1173903.mozfiles.com/files/1173903/7794734772.pdfIn PDF document text
    • https://cdn.sqhk.co/rumomezojeku/gihg9ii/dictionary_app_for_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455180/normal_5fd17ef46d476.pdfIn PDF document text
    • https://site-1206062.mozfiles.com/files/1206062/buffalo_wings_and_rings_close_to_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474752/normal_5fe5aca595924.pdfIn PDF document text
    • http://bogavevi.22web.org/first_grade_worksheets_printable.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/60249647340.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/bass_booster_pro_apk_latest_version.pdfIn PDF document text
    • http://megutid.epizy.com/agrochemicals_and_their_effects.pdfIn PDF document text
    • http://xifonefoje.epizy.com/viguvetanot.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/fitbit_charge_3_special_edition_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/4th_grade_division_problems_with_answers.pdfIn PDF document text
    • http://topufopotu.epizy.com/i_love_you_samantha_sheet_music.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

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_off0000e61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61D 5204 bytes
SHA-256: b4fb57f0d63d46f961e14f3c8b1172ddeda27791b39331d9d840f4f75d5c7d24
font_01_sfnt_off0000f7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D3 10608 bytes
SHA-256: 5de8dc9783d57452a9663b14ac61cf1749753acf91b1ff601cea569356dbb704

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