Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b3b2514e33b054…

MALICIOUS

PDF

232.6 KB Created: 2021-03-19 11:13:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1e254b8aabe25cedc814d994c909ea0c SHA-1: 20884230664054822b03d162016865964b3681ac SHA-256: 79b3b2514e33b0540a676835f1ea3b9a49bd9ebc8018b3464ff49782d5d49926
104 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and a heuristic firing for PDF_URI, indicating it attempts to direct users to external resources. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lure (owner's manual) point towards a phishing attack aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9856

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jumiwimov.ru/123?utm_term=canon+6d+mark+ii+owners+manual PDF link annotation
    • https://cdn.sqhk.co/morureju/jggiihd/how_to_grow_your_business_credit_score.pdfIn PDF document text
    • http://kofodotig.sportsontheweb.net/basic_poetry_terms.pdfIn PDF document text
    • https://jeletaru.weebly.com/uploads/1/3/5/3/135321400/3e200.pdfIn PDF document text
    • http://palikexifumalam.mywebcommunity.org/vadixibojob.pdfIn PDF document text
    • https://cdn.sqhk.co/gixotagokezu/EhiWHie/38318935176.pdfIn PDF document text
    • https://gozerezujokosas.weebly.com/uploads/1/3/4/8/134856803/b9c3a277666570c.pdfIn PDF document text
    • https://cdn.sqhk.co/zaliroded/ichcXif/murder_mystery_party_christmas_theme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419235/normal_6012ca4df0600.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464297/normal_6009056791cdd.pdfIn PDF document text
    • https://gitikaru.weebly.com/uploads/1/3/4/9/134901111/fukigomoxesizuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec0d5284-b675-4643-8340-e70a82b8d927/curso_de_guitarra_para_nios_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d981b129-92b0-4327-86a7-87c7d0cb734a/kufipezavakega.pdfIn PDF document text
    • http://tobikinos.onlinewebshop.net/fewesumal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32c7fc5e-3275-4aaa-a313-634a2b07ef98/48097597134.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38b648bf-f97a-4413-b52a-861cb704224a/midi_to_usb_cable_vs_interface.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f88fd7cc-9606-456a-a067-0e937f3e2fde/nikon_coolpix_s33_battery_exhausted.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c1d43eb-7972-4160-b4b4-2ca55deec0bd/how_do_i_find_my_local_post_office.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_off00034ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34CA1 2828 bytes
SHA-256: ec0617e7d4b767a4f38c4993bdaaecdad4a8b4ca688b321d2bd370a6bc92076d
font_01_sfnt_off000356aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x356AA 5188 bytes
SHA-256: 440f742bf8503803c28d7af2c0426811e1b1a38ea8a83a692add1b4993737f12
font_02_sfnt_off00036849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x36849 13168 bytes
SHA-256: cef517a29182027342eba6b09f5c0c1236757f01d2d4eccfe738f037713558ea

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