Malicious PDF — malware analysis report

Static analysis result for SHA-256 326505e49a8b0bcc…

MALICIOUS

PDF

80.5 KB Created: 2021-03-22 05:51:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5634c52658826b888254f682da5d9f85 SHA-1: 96d44b1537b5450b844db090205a881a243217b9 SHA-256: 326505e49a8b0bcc19eb9237cd35204b921ef907045c212b6cefa25790589673
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous external links, with one pointing to 'vilenefex.ru', suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/strik?utm_term=heidelberg+catechism+1563
    • https://cdn-cms.f-static.net/uploads/4459784/normal_600a66c9d8f2d.pdf
    • https://xaxibilezulaf.weebly.com/uploads/1/3/4/0/134096047/1886967.pdf
    • https://cdn-cms.f-static.net/uploads/4381528/normal_60491e33471cd.pdf
    • https://cdn-cms.f-static.net/uploads/4470389/normal_603432d14c2f5.pdf
    • https://sulesebu.weebly.com/uploads/1/3/4/6/134634805/vodukobovefer-gokeg-bajikokijeso-ruzigubeza.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://82c1a4a6-0aea-44ab-842b-07cb5bdde860.filesusr.com/ugd/aafee9_f45481cd98ec4105b66cc8c1ebb9100f.pdf?index=true
    • https://s3.amazonaws.com/kefodek/98065065529.pdf
    • https://s3.amazonaws.com/xowasosuf/25866925694.pdf
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_9ea5449529c740a29d9a2559c2a0e957.pdf?index=true
    • https://uploads.strikinglycdn.com/files/05c545ec-ebb4-4cba-ba84-f1d548dac04e/understanding_computers_today_and_tomorrow_15th_edition_chapter_1.pdf
    • https://uploads.strikinglycdn.com/files/f7a4945b-025a-4f98-8470-3de1c4d12d3d/intex_krystal_cleartm_sand_filter_pump__saltwater_system.pdf
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_a5b0828de7fb488eb6408487099dccb8.pdf?index=true
    • https://s3.amazonaws.com/julexekubaj/daworexanizozibidezolo.pdf
    • https://s3.amazonaws.com/pazerogasarinu/zixeruvemegopatu.pdf
    • https://uploads.strikinglycdn.com/files/e8a3f50f-db10-40a0-badf-3c5dc0e1910c/what_is_honda_b1_service_cost.pdf
    • https://9042e326-c85f-44e6-b9b6-0c206471fdba.filesusr.com/ugd/0d2fda_71a9524f8c6c4662b6c08bda74138a24.pdf?index=true
    • https://s3.amazonaws.com/fekife/45470220382.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_off0000f83e.bin
3a7c8ea65848933fda2480a11cb62013e3f63c0bf809d6049e1cc60d8d40adfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF83E 5948 bytes
font_01_sfnt_off00010c51.bin
18718379dc93752d4cf83645a73ffb473fb2063248fb321ef703500eeb644539		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C51 11728 bytes

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