Malicious PDF — malware analysis report

Static analysis result for SHA-256 79820107e7b28adb…

MALICIOUS

PDF

81.2 KB Created: 2021-03-23 21:47:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8aca08982d754b8aa55748d0be3e7d16 SHA-1: b1169c583a23ce415e00f391ff7705948398df05 SHA-256: 79820107e7b28adb3e7f98248e02b95962757165ba19218f311c3a9293889566
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous external links, with one notable URL pointing to 'dafemum.ru', suggesting a phishing or malware distribution attempt. The PDF structure and embedded content indicate it's designed to act as a link farm, potentially for SEO manipulation or to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/wix?keyword=animation+throwdown+mod+apk
    • http://spindlndou.space/94078796755nmnpg.pdf
    • http://retys.space/39604425824qf5d4.pdf
    • http://all-casino.xyz/raketesewemukinusires2vsm.pdf
    • http://olymp-trade.top/10280956877m1g73.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_a8e42318c4564bc6bd75f876f903aca8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/49e89e56-16fc-43bd-abf7-469384f9c7b1/nagalukojopukiparilanip.pdf
    • https://s3.amazonaws.com/fejatepudopito/36480742344.pdf
    • https://uploads.strikinglycdn.com/files/73b88111-e1c1-45e0-a033-2563d70f17d4/what_should_i_paint_for_my_boyfriend.pdf
    • https://0ea1ff7f-05b3-43a2-9744-178351a05ed1.filesusr.com/ugd/01f9b9_87ccec1f190b4fdab971aedb093a31cf.pdf?index=true
    • https://5c09c65f-4728-49e3-9562-8692e696fc4f.filesusr.com/ugd/32acb1_373097d3470f4cd7a10b9a0775fba2a2.pdf?index=true
    • https://s3.amazonaws.com/nevovumowa/49254890169.pdf
    • https://18b62485-dce0-4e35-9712-b1d1f13fcb23.filesusr.com/ugd/296484_b4be7070202e4df7adb5a9d06a1485eb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3fc4cfac-5453-45c1-82b5-c6579ce3a40a/probability_and_statistics_for_data_science_book.pdf
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_385b3cfbdbae49a08e8fc14206e4370f.pdf?index=true
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_ac160ca71eea4a0eb33ccc0a3491d154.pdf?index=true
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_d38832d3a46143f0aec10ff3b9f49947.pdf?index=true
    • https://2eda13a9-9e0f-47dd-bbfa-a9a5028a3314.filesusr.com/ugd/61c57f_3fd85eb4c7d544fca38c7f9e90356f10.pdf?index=true
    • https://s3.amazonaws.com/midizaxopazeji/saxenufidokipotud.pdf
    • http://zisunajupanege.rf.gd/20604011061.pdf
    • http://dawiwafawuz.epizy.com/charlie_malayalam_movie_video_songs.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_off00010122.bin
a2bff84942ed3b6f1f36692837f063552db8115ca0f04662271df4b126ebf25a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10122 5136 bytes
font_01_sfnt_off0001127a.bin
9d226a6638f15cf1a8f8f3c87016ed1af5af5b903843babe9922a1983512ed9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1127A 10808 bytes

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