Malicious PDF — malware analysis report

Static analysis result for SHA-256 84dfb180eead6cf9…

MALICIOUS

PDF

76.9 KB Created: 2021-04-19 02:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 037121586feddd27886f937096fbe658 SHA-1: bc26624d7149c0aed4bc5521837c9cb95c6bbb3d SHA-256: 84dfb180eead6cf92393c5765b99cb43944d7ddeab7b6697704feab18afcc8f8
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains text related to product pricing, which is likely a lure to direct users to external URLs. The presence of numerous embedded URLs, including one pointing to `midufefew.ru`, suggests the document is designed to redirect users to potentially malicious sites for phishing or further payload delivery.

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://midufefew.ru/strik?utm_term=samsung+grand+prime+plus+price+at+pep+2020
    • https://cdn.sqhk.co/junukexad/b6Ycies/49542938243.pdf
    • https://cdn.sqhk.co/bogovureg/IMWMgjj/96332104960.pdf
    • https://cdn.sqhk.co/wugotiparo/8eigyie/jonamutile.pdf
    • https://cdn-cms.f-static.net/uploads/4402486/normal_600c1bf2d79b5.pdf
    • http://fazejajogavu.medianewsonline.com/dr_seuss_reading_games_cat_in_the_hat_pc.pdf
    • https://cdn.sqhk.co/noxivudeva/jfgfYtq/sogaderunaminawalaweruvaf.pdf
    • https://cdn-cms.f-static.net/uploads/4366668/normal_6058d7ddb1b0d.pdf
    • https://cdn.sqhk.co/fogunedevare/jgJZKZd/lebonazobabasalefopogabap.pdf
    • http://tatuxuvoziparu.mywebcommunity.org/bericht_schreiben_grundschule.pdf
    • https://cdn.sqhk.co/kujufemom/hhahejc/sesuxo.pdf
    • https://cdn-cms.f-static.net/uploads/4450876/normal_6028eb55e0054.pdf
    • http://judugasolunived.22web.org/why_is_there_water_in_my_whirlpool_water_softener.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tinajabizoreguf/beatles_yesterday_tabs.pdf
    • https://s3.amazonaws.com/xajowu/96107330440.pdf
    • http://napamewa.atwebpages.com/35655541036.pdf
    • http://tawexega.epizy.com/main_vichara_song_pagalworld.pdf
    • http://zitadufafasid.onlinewebshop.net/verbal_reasoning_sample_test.pdf
    • https://s3.amazonaws.com/zafaronivaj/survival_food_buckets_walmart.pdf
    • http://nukilaba.myartsonline.com/gidatijumukofuwawaxas.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eda3.bin
646dc9a95be92f8b10dd73239845f617e5e3899ac20f874d326548e65216aae5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA3 5768 bytes
font_01_sfnt_off0001012c.bin
bed3108242387f7dc8ad135cae6d603202bef7963636ddb08c83d69717d849fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1012C 10752 bytes

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