Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cc870b7dd2f6d85…

MALICIOUS

PDF

74.9 KB Created: 2021-02-02 20:16:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5222f64e4978bc01a8e2b048126bd30c SHA-1: 7cfb5344dc33839e07f43e65a3dd99618125b425 SHA-256: 1cc870b7dd2f6d8583594e5ffee0ee25f717b1a75853b06782c17eb99bb399e4
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to obscure the true destination by using multiple disposable domains and UTM parameters. Although no scripts were explicitly extracted, the presence of external links points to an attack pattern involving directing users to potentially harmful content.

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://maypoin.ru/123?utm_term=funny+sheet+ghost+costume PDF link annotation
    • https://cdn.sqhk.co/konidadelan/CtidVid/epson_iprint_pour_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/bobavijiwoba/YhjYgiy/kefimodorijov.pdfIn PDF document text
    • https://cdn.sqhk.co/vunelebu/RNRhbgi/modern_warfare_patch_notes_september_15.pdfIn PDF document text
    • http://perinolaguzur.iblogger.org/malayalam_movies_2019_tamilrockers.pdfIn PDF document text
    • http://rumajasajobotod.iblogger.org/matuvuzurajatifeluboku.pdfIn PDF document text
    • https://cdn.sqhk.co/kewusikata/Zxqesh0/istation_reading_with_isip_login.pdfIn PDF document text
    • https://fewupebotugap.weebly.com/uploads/1/3/0/7/130739906/divikukigop-fesusanumirilox-fulem.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/pEijjeN/pot_painting_ideas_images.pdfIn PDF document text
    • https://cdn.sqhk.co/raninogozo/hhaidbq/52002100323.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373526/normal_600332e986ef0.pdfIn PDF document text
    • http://nivawegokex.22web.org/asus_precision_touchpad_driver_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/kelanadu/jdjbjij/little_live_pets_my_dream_puppy_soft_toy.pdfIn PDF document text
    • http://xekuluw.iblogger.org/97936599440.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luxepiluwi.epizy.com/baarish_yaariyan_song_pagalworld_female_version.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_off0000e954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE954 4932 bytes
SHA-256: 3cebae8f829e405b0d72d8a2a0dab944b2f7e409a779918e79014ec0ace2d1ae
font_01_sfnt_off0000fa11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA11 10852 bytes
SHA-256: c775cafd42379defde927957e7a1129380e5295d550192848f6773c3e8528867

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