Malicious PDF — malware analysis report

Static analysis result for SHA-256 20388f406f13982e…

MALICIOUS

PDF

77.8 KB Created: 2021-04-24 05:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 340855d00a05326e5d0df65aef8586d6 SHA-1: 80ff72bfc94c705a3fa58857de2a3064e1bcf188 SHA-256: 20388f406f13982eb192acfb8c74a149d9ec169138e13c8917b203911d7fe399
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of embedded external links, suggesting a link farm or phishing attempt. The presence of external URIs and the PDF_SEO_LINK_FARM heuristic indicate a strong likelihood of directing users to malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://baarspo.ru/strik?utm_term=what+is+grinding+gears+in+manual+transmission PDF link annotation
    • https://xirejefeju.weebly.com/uploads/1/3/4/7/134723985/jesase.pdfIn PDF document text
    • https://kutawujotin.weebly.com/uploads/1/3/4/0/134016956/pokuxufoxovor_xorezim_zenawim_vaxini.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384144/normal_5ff75f6a489de.pdfIn PDF document text
    • http://tubujefowabe.medianewsonline.com/strength_of_materials_formulas_for_civil_engineering.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470980/normal_5fda89b987044.pdfIn PDF document text
    • https://rokumetusemep.weebly.com/uploads/1/3/4/3/134382705/fadojerifagakuguk.pdfIn PDF document text
    • http://letabumo.getenjoyment.net/todemakulivitimokenex.pdfIn PDF document text
    • http://suraneb.scienceontheweb.net/traditional_catholic_prayers_in_latin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388814/normal_606a0c7b9845f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4531626/normal_6015851fa61f5.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/bc28d629-08c8-4c07-bc05-84ba85cc2819/82087963618.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/what_are_the_5_types_of_advertising_media.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/77802780285.pdfIn PDF document text
    • http://vakizonozajaxe.onlinewebshop.net/uk_driving_theory_test_app_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/3825108499.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/brick_game_free_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2431556-68ff-46e8-9fe8-f73756eb6ff2/relion_prime_test_strips_amazon_india.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/12072022688.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebf0f841-5b78-490c-8cd6-e8bd802317e8/ginovoxolejexaje.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/42692276386.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/28821566325.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/589bb776-478d-4861-968c-69e15d3e0de3/dokipezo.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/what_does_beast_represent_in_lord_of_the_flies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aba258b-4076-4063-84f5-0b0325720c40/55931165724.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C4 5252 bytes
SHA-256: b123432b20daaab20c0f4b351b79c32486d540034d79dd17c1a2dad579dbf2a1
font_01_sfnt_off0001047e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047E 10272 bytes
SHA-256: 8ca42828391c0a475c02cfd9103084160b27325b171c6feee6ddd5bb8830ecf1

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