Malicious PDF — malware analysis report

Static analysis result for SHA-256 72977f963af63183…

MALICIOUS

PDF

84.1 KB Created: 2021-04-13 20:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 1328a59d1eb3c783a53a0b9c39f3fac9 SHA-1: e847bcab668399ab56dc954d665566f15a3388ff SHA-256: 72977f963af63183a3725cbbcd88213ea2803a55efc7a00a24a35c95fe65592a
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. One of the primary URLs, https://seumenha.ru/strik?utm_term=what+are+the+four+types+of+operant+conditioning, is likely part of this malicious infrastructure. The document body contains garbled text, indicating it is not intended for direct user consumption but rather as a vehicle for the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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://seumenha.ru/strik?utm_term=what+are+the+four+types+of+operant+conditioning PDF link annotation
    • http://interstart.online/ziwesh2eec.pdfIn PDF document text
    • http://waystep.site/61568993048dy6gz.pdfIn PDF document text
    • https://jufavufopu.weebly.com/uploads/1/3/4/3/134340263/ee78d6be585ea4.pdfIn PDF document text
    • https://timakopazasiri.weebly.com/uploads/1/3/4/4/134445807/mesokodaded.pdfIn PDF document text
    • http://everydayy.fun/27646845481htoe4.pdfIn PDF document text
    • http://busurman.space/introduction_to_cost_accounting_questions_and_answerskzs68.pdfIn PDF document text
    • http://bafifotazadanov.iblogger.org/mabeninusibagi.pdfIn PDF document text
    • https://nesilinazum.weebly.com/uploads/1/3/4/8/134886609/1245755.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0c8056c3-0266-4bef-bf43-8bd4a5b04a06/how_much_does_a_polaroid_cost_at_walmart.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/windows_bitmap_image_to.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d344534-92dc-45a6-9ac4-6f1680706b4f/writing_tools_50_essential_strategies_for_every_writer.pdfIn PDF document text
    • http://kadozebozedakof.rf.gd/dd_pizza_menu.pdfIn PDF document text
    • http://nisinukodepafix.rf.gd/supposed_former_infatuation_junkie_songs.pdfIn PDF document text
    • http://daxafedijumexir.rf.gd/cefazolin_oral_form.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/grooms_speech_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/618137c9-14b0-4966-8ad1-d6489ab90374/invitation_to_the_psychology_of_religion_3rd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/529208ee-2492-49b7-818c-23747b21f51d/how_to_do_picture_logic_puzzles.pdfIn PDF document text
    • http://lifised.epizy.com/pulepeselamereloxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b422b864-78d0-436e-8c6a-36b33cd43156/16872459895.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09b6e35b-e941-4000-af93-2b44df75ef3b/par_quoi_remplacer_le_mascarpone_chantilly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b54b4ce3-a3c5-4cd6-a751-1b68d7828b93/one_punch_man_list_of_characters.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/zewije.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_off0000fb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB58 5380 bytes
SHA-256: 5e6b73bbab68a1c64f37379c6d5634a85750701323f25cd5f7996e5e356677c6
font_01_sfnt_off00010db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB7 11364 bytes
SHA-256: ed8a443c8cdd8ade33dcc418a3f1e3451d0dfa74a0d3d620038c84b16210b757
font_02_sfnt_off00013450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13450 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e