Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f0c436418ca8351…

MALICIOUS

PDF

83.2 KB Created: 2021-06-10 08:27:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 64ead6aeeb37f6908f235254f07388ba SHA-1: c53616faee27f51c4a06cd3238f5966aa529fbbd SHA-256: 1f0c436418ca8351fdf588ee0adf916a04b98b68c336f4d1eca3b46c96e46ed3
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a malicious document, specifically a link farm designed to redirect users to external sites. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, with one prominent URL being https://xezojetit.ru/123?utm_term=data+mining+for+business+analytics+solution+manual. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://xezojetit.ru/123?utm_term=data+mining+for+business+analytics+solution+manual PDF link annotation
    • https://pimakiwukusa.weebly.com/uploads/1/3/4/7/134712386/gabobiwito_gajaroluzamor_tigodi_nofebod.pdfIn PDF document text
    • https://kuvolobogon.weebly.com/uploads/1/3/4/0/134012650/lupigunigumipab.pdfIn PDF document text
    • https://pamibatofenowa.weebly.com/uploads/1/3/4/5/134525539/6586342.pdfIn PDF document text
    • https://miwidikanizi.weebly.com/uploads/1/3/4/0/134016908/xegegut.pdfIn PDF document text
    • https://tiwedipetubed.weebly.com/uploads/1/3/2/8/132816066/1636018.pdfIn PDF document text
    • https://votuwokikinoso.weebly.com/uploads/1/3/4/4/134466575/dafigewodafeletip.pdfIn PDF document text
    • https://ridakikasidom.weebly.com/uploads/1/3/0/7/130739592/497736.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zabodovojif.pbworks.com/f/surah_rahman_qari_abdul_basit_download_mp4.pdfIn PDF document text
    • http://tukufidanega.pbworks.com/w/file/fetch/144426879/17087829025.pdfIn PDF document text
    • http://mizelabe.pbworks.com/f/rigevalosoga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f583e6cf-b824-4afe-8f3f-d59a5f6d8d5d/dream_interpretation_dog_feces.pdfIn PDF document text
    • http://bawamotijeku.pbworks.com/f/anet_a8_octoprint_firmware_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea21554c-497a-460a-b1e6-bfde7bbbbbce/morapenudusalanesepaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46422a18-338b-459f-afc8-fb38969fc166/the_princess_bride_full_movie_in_hindi_dubbed_watch_online.pdfIn PDF document text
    • http://gifavipa.pbworks.com/f/13431116996.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7001e454-33be-4d3e-9a27-f129e5ad0b24/kefafojagizepupa.pdfIn PDF document text
    • http://sozakuvepar.pbworks.com/f/call_of_the_wild_essay_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/997e82b1-79e1-440a-8c73-9311b3b8f72c/what_foods_to_eat_while_taking_phentermine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eca68286-ed9a-4c7b-8366-355eb1ec27d8/neviwigixorisofipojeva.pdfIn PDF document text
    • http://tujedet.pbworks.com/f/bunegej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab08777e-c89c-4d1c-a841-355b152c577b/kindle_d01100_will_not_turn_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dca73eb-2661-4aca-a917-b5b9b44e76cc/30297511786.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3055d12f-65db-4d37-9c6f-e85bbb08102f/where_is_the_wps_button_on_tp_link_router.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/242bfd61-040d-4898-a136-810a6ed60ab8/mepij.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_off000105b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B3 5444 bytes
SHA-256: a8c14bda070cfee935e75f25a2327bfb0607540da2386ad32cca65c6aecc7828
font_01_sfnt_off00011838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11838 10852 bytes
SHA-256: 0fd00b6d3c5e40c333b1a89f48feb4cb61e5a55d3469754f9e7aa15fbfa7032a