Malicious PDF — malware analysis report

Static analysis result for SHA-256 8248f09cdd92a8fe…

MALICIOUS

PDF

82.4 KB Created: 2021-03-13 22:29:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 084902e3e8ed3258a0e16e924f0ea91c SHA-1: 7b38ba33ccd9767b1f113fcda53d6c9202c12467 SHA-256: 8248f09cdd92a8fe1dc6b5f2b31899b52295baaa25820adba944ebb0f8fa08cf
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains numerous embedded links, including one pointing to a known malicious redirector at 'crophysi.ru'. The document body, though heavily obfuscated, contains strings related to tutorials and books, suggesting a lure for SEO-based phishing or malware distribution. No scripts were extracted, but the presence of malicious links indicates an attempt to redirect the user to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://crophysi.ru/award?keyword=best+java+tutorial+for+beginners+pdf In PDF document text
    • http://gepexoliv.medianewsonline.com/discrete_mathematical_structures_4th_edition.pdfIn PDF document text
    • http://tanolugulutewu.medianewsonline.com/difazejof.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/261c8588-0f56-4695-b958-2210f978d43d/game_of_thrones_first_book_chapter_1.pdfIn PDF document text
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_94097267cc914dc09c27b6a120cda3cb.pdf?index=trueIn PDF document text
    • https://425e2ee7-996f-4c6d-a593-b44a2a39b733.filesusr.com/ugd/bb05c1_599e4abf96a4493589fdbc61e0236169.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/84978ece-2bd4-4b6a-99ba-d493d0f34ec6/what_colors_compliment_blue_green.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/54915252691.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/butovamobugatesivugekuv.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/58673998223.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/bewars_movie_songs_in_sensongs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a51ccc5-75ff-4211-9116-8cc7a1d8beaf/70526987766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27d548dc-ef03-4311-8fa1-8d4e0100e179/super_mario_galaxy_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/upstream_workbook_level_b1_answers.pdfIn PDF document text
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_626ecadfc50e4907b7edd23dc31ca4a3.pdf?index=trueIn PDF document text
    • https://4aed96f8-dbfa-45c2-b5b2-bf316f1cddd9.filesusr.com/ugd/9b7d8a_1a85962a645d4b8dac32228caa13057e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/980f5b9c-9f7e-4fd0-a489-54022f3f6505/how_to_connect_mac_to_samsung_smart_tv_bluetooth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2215b614-ed89-4777-96ca-e5a34326567d/zefagajitolozuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06bde3fe-364e-4042-9e07-f5d7e6d07865/pekanuja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2808f75e-d9fa-4870-ba42-fe5dc2c50650/34535025648.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/gina_guidelines_for_asthma_2018.pdfIn PDF document text
    • http://netomadutimafe.onlinewebshop.net/3909173015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad981af8-0380-47e2-97b8-03bc00f03945/ritotozasosisuta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae3c99b0-617e-4c81-834a-c64d8200093f/parijebafazanuxuzize.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_off00010312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10312 5532 bytes
SHA-256: 5ce52197a32f802bdd745005483d8f3fc816c115a9bcdd7f6442dc496222822d
font_01_sfnt_off000115fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FD 11204 bytes
SHA-256: 70f5e29582d42ef38231a856c3f096588009d51f87d7ed0ee5b37c905659b440

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