Malicious PDF — malware analysis report

Static analysis result for SHA-256 452f49542aabcdfe…

MALICIOUS

PDF

68.4 KB Created: 2020-12-18 00:49:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2a58fbb7054e4e570a70c70ae5c57484 SHA-1: 9d05eb435f8d37bfdfb2e6ea7d2c09502baeacaf SHA-256: 452f49542aabcdfedca13060f498c4e35304b7cc9b6ecebc811c04c6edfb8c35
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous external links, including a primary suspicious URL, traffset.ru, which is likely used to redirect users to a malicious site. The document body, though heavily obfuscated, suggests a lure related to a "period repair manual pdf", likely a pretext for the phishing attempt.

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 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.
  • 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://traffset.ru/123?utm_term=period+repair+manual+pdf PDF link annotation
    • https://newejata.weebly.com/uploads/1/3/3/9/133999860/960849.pdfIn PDF document text
    • https://bitivomo.weebly.com/uploads/1/3/4/4/134478942/dojifizovo-dexopusal-zozojowuzexunuf.pdfIn PDF document text
    • https://toraboretopupu.weebly.com/uploads/1/3/4/7/134769369/burekofenib-gexosavuluzi-gevokofepogej-lubunuba.pdfIn PDF document text
    • https://zisikokemebekus.weebly.com/uploads/1/3/4/2/134235681/duwojopu-gimidon-wadigopis.pdfIn PDF document text
    • https://nagigezivozitos.weebly.com/uploads/1/3/4/3/134340852/1cdb5cadf0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d525e06b-73c8-45d4-b1f7-d9127696ad2c/hiv_aids_worksheets_for_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/594e3092-5648-4f2b-8785-2be665e23061/3d_dice_roller_windows.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97e605ee-aef0-4421-9578-954fdd745575/21908274575.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3fdff03-0204-44cf-8137-f5c811ef92fd/bazumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/255dbbd9-0a21-4534-be23-27e78beaadf8/79561405840.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54278f67-3d8c-47ee-b2e3-f009d61d41ef/keep_your_daydream_youtube_season_7.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/because_i_m_stupid_video_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f3435a5-9e55-4a1d-9423-116952dce2c6/gewuxevoxamukigeni.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61A 4812 bytes
SHA-256: 78c89a50aea52a0a51ec89a49204827347378bf463559b60c12d5f10352a48e2
font_01_sfnt_off0000d64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64E 9556 bytes
SHA-256: 80ce50a47ad3d7e4a5b515229958dab6282b00b11023178348d50f738e3c2fc9
font_02_sfnt_off0000f6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F3 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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