Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec87c8bf99a9cbd…

MALICIOUS

PDF

78.5 KB Created: 2021-03-23 01:51:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 951f6af17446f25ccb95c3907e6ebc43 SHA-1: b254ee298762fac8a25c6e3ec89660d84727f565 SHA-256: 8ec87c8bf99a9cbddfbd522997167d7daba8ba206cfa8b4a0a5b5a1ad8d8b23c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/123?utm_term=burrito+bison+launcha+libre+unlimited+money+apk
    • http://dirtygirl.fun/90070177666b146u.pdf
    • https://cdn-cms.f-static.net/uploads/4413121/normal_604a23eb018f4.pdf
    • http://jesawukimefix.mypressonline.com/88219759302.pdf
    • http://tuzojexis.mypressonline.com/pradhan_mantri_awas_yojana_online_form_download.pdf
    • https://static.s123-cdn-static.com/uploads/4476566/normal_6000eaf35eb18.pdf
    • http://carins.info/do_programmers_get_paid_well2o9es.pdf
    • https://cdn.sqhk.co/mogezunir/aChbjg8/time_idle_rpg.pdf
    • https://cdn.sqhk.co/zimopiroxab/ieid0L5/1067303569.pdf
    • https://static.s123-cdn-static.com/uploads/4368748/normal_5ff5ada86642f.pdf
    • https://cdn.sqhk.co/vazoguzo/LwjbRhd/goniwe.pdf
    • http://m-laskin.ru/bemasebitibitexokida41on6.pdf
    • http://esportzmlevent.com/41634981025nz3w6.pdf
    • https://static.s123-cdn-static.com/uploads/4452161/normal_5fe5c2681ecc6.pdf
    • http://rubeatyshop.xyz/diy_dry_cell_hho_plansn5vq9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sulorowanutabu.atwebpages.com/boronizing_process.pdf
    • https://s3.amazonaws.com/xozeb/40670071409.pdf
    • https://d64d5b41-a66a-4b78-b87f-0feaf8e9cf76.filesusr.com/ugd/cf1aed_c5dbf005c9424b91ae08e8d778345ed1.pdf?index=true
    • https://926da24b-d3df-4aea-ac1b-ebdf7359a9e7.filesusr.com/ugd/fef925_2ac00156655d47fcbb4acdd63f07f3cf.pdf?index=true
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_709ce369e2be4b8d9e171872e2275932.pdf?index=true
    • http://totuxivez.onlinewebshop.net/peg_perego_toy_car_john_deere_gator_xuv_green_igod0063.pdf
    • https://s3.amazonaws.com/timeziso/20969674282.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_off0000ec54.bin
d41df573bd66e9498ba3ccbdc9067f245a65078b715e8c0ea2301c690dfb3372		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC54 5668 bytes
font_01_sfnt_off0000ff6f.bin
e408234a7071ca24f8c5bca9478ea9d619dd4914c98b129c09f0ac32e9d7118a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6F 14544 bytes

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