Malicious PDF — malware analysis report

Static analysis result for SHA-256 68d3df5b4d407532…

MALICIOUS

PDF

82.6 KB Created: 2021-04-07 02:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8113be79336b9f79ee63897d98422db7 SHA-1: 49f52cc02e572d5fc48c3505eeb8bd3da0c72e3b SHA-256: 68d3df5b4d4075321bbd55b838d4aace3079c7cb3aa5541c569f6d3fe8ab3677
146 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous external links, many on disposable domains, and the impersonation of cloud document services strongly suggest a phishing or malware distribution attempt. The embedded URLs, such as https://pelibifir.ru/strik?utm_term=online+project+management+software+free, are likely used to redirect the user to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://pelibifir.ru/strik?utm_term=online+project+management+software+free PDF link annotation
    • http://ragofilud.medianewsonline.com/fefenivoxekidu.pdfIn PDF document text
    • http://mobutadaxez.medianewsonline.com/english_words_antonyms_and_synonyms.pdfIn PDF document text
    • https://cdn.sqhk.co/sabumijobude/ghaL6hf/45569654295.pdfIn PDF document text
    • http://fuvagezilavez.mygamesonline.org/critical_thinking_interview_questions.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/eInjjoj/42667671664.pdfIn PDF document text
    • https://cdn.sqhk.co/xugumewaz/hggeggg/2020.pdfIn PDF document text
    • https://rofovotojoroko.weebly.com/uploads/1/3/4/8/134878837/88d6dfc.pdfIn PDF document text
    • https://wowajonaj.weebly.com/uploads/1/3/4/7/134717857/9687f1aa.pdfIn PDF document text
    • https://buwofapakudo.weebly.com/uploads/1/3/5/3/135316190/be7a677cb3d.pdfIn PDF document text
    • http://lejifip.sportsontheweb.net/learn_japanese_language.pdfIn PDF document text
    • https://lujuvikib.weebly.com/uploads/1/3/1/4/131406806/ecd1f.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/9b85d20b-2c24-47ea-b116-0104bf0e9bc8/9328402689.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93064fb0-95af-4948-ae82-d9932a9f553a/xamejubebokogigomulefir.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/mizuwasuvajobupig.pdfIn PDF document text
    • http://kapetevik.epizy.com/angry_birds_game_for_android_phone.pdfIn PDF document text
    • http://pogelejulogowev.rf.gd/body_system_interactions_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/571c8ea0-bcef-48b2-ad2c-446eb9b20f26/geruromixafubiwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc918901-41ee-48a9-af31-8415f8335320/what_good_movies_are_on_amazon_prime_free.pdfIn PDF document text
    • http://gisoduriri.rf.gd/video_facebook_computer.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/irrational_numbers_worksheet_answers.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_off0001009d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009D 5528 bytes
SHA-256: 4c35f34188687f021a0fc1938c81c133a318ceaf2725c3bec903e820c2c1c599
font_01_sfnt_off00011367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11367 12664 bytes
SHA-256: e9645001465e1b3dd4877a4d30a3160b1f664e6e9de0c18379ace6be913c1d2b

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