Malicious PDF — malware analysis report

Static analysis result for SHA-256 392113fef77b3f18…

MALICIOUS

PDF

78.3 KB Created: 2021-03-18 19:55:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a2202d774f9874c6aad32ba9b4e1448 SHA-1: 8013ef9de4087e828aece420e0440da50c1bef5e SHA-256: 392113fef77b3f1845b118e2f3ba92032e0eab2642527a5dec99431974b7a52c
126 Risk Score

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 prominent URL pointing to a suspicious domain (`resalured.ru`) that is likely used for phishing or distributing further malware. The document body, though heavily obfuscated, suggests a lure related to 'estimate forms', aligning with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/123?utm_term=custom+carbon+copy+estimate+forms
    • https://cdn-cms.f-static.net/uploads/4372753/normal_604934aa5ce75.pdf
    • http://wekifojedopike.22web.org/how_to_treat_metabolic_acidosis_in_neonates.pdf
    • http://digitalliteracyinstitute.com/metar_decoder_onlineksqpm.pdf
    • http://waranijovuv.sportsontheweb.net/the_standard_apartments_fort_collins_co.pdf
    • http://dkshlyap.ru/how_to_trade_options_beginnerj6okb.pdf
    • https://cdn-cms.f-static.net/uploads/4464053/normal_604fb4bdbc062.pdf
    • http://idealica-italiaufficiale.site/4381472824bid9b.pdf
    • http://pebonemariv.mypressonline.com/sirabasinibi.pdf
    • http://fafuzum.sportsontheweb.net/battery_capacity_calculation.pdf
    • https://cdn-cms.f-static.net/uploads/4475716/normal_602f018444b97.pdf
    • http://vifezitenof.getenjoyment.net/34086625611.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://milebulijulami.onlinewebshop.net/4580364033.pdf
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_d19eab5ca39741beb9ffcfa3f781a930.pdf?index=true
    • http://rawigukegopafot.onlinewebshop.net/20422922344.pdf
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_0b5758e7498349b39d9d568734fdbca8.pdf?index=true
    • http://zukowuneze.rf.gd/tevumonelo.pdf
    • https://a5a8f6e1-24ae-425c-880d-6f4079e3c376.filesusr.com/ugd/035627_487e7cb63a8e45b6b6bb4497c7f603be.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6e4.bin
cb0f3b447ea24c96a1a432f67840cf895b59590c16e99537722ee3b6446d86c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E4 5276 bytes
font_01_sfnt_off0000f8c1.bin
f05de8e229f786a82a11ac6fda3303cbc344e2bae0334d57960f45bb8ea0ac46		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C1 10848 bytes
font_02_sfnt_off00011db8.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB8 4324 bytes

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