Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c3c61ee14cd772a…

MALICIOUS

PDF

73.2 KB Created: 2021-03-08 11:55:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 03aa3cba784d93697557c86576a276e1 SHA-1: 952b280bac4ec8214e584b30142c1853e62e35c5 SHA-256: 5c3c61ee14cd772aa10073430aacf3077119342307529ec6b067ca8e75b6578d
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to zajinet.ru, which is flagged as suspicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or spamming operation. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score point towards a malicious intent to redirect users to potentially harmful content.

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 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://zajinet.ru/wb?keyword=how%20do%20i%20change%20the%20lightbulb%20in%20my%20fisher%20and%20paykel%20fridge PDF link annotation
    • http://makamar.xyz/can_you_make_pound_cake_without_a_bundt_pan0sl5a.pdfIn PDF document text
    • http://fastdonwload.space/907077101909lag0.pdfIn PDF document text
    • http://ladukusuga.22web.org/59709330536.pdfIn PDF document text
    • http://verifedform.com/the_culture_code_chapter_16_summary71l0t.pdfIn PDF document text
    • http://theharaka.online/mazotufovawaderenasemogq74lr.pdfIn PDF document text
    • http://flowerport.market/4747904116176p70.pdfIn PDF document text
    • http://kiladuwujufuzav.22web.org/nifuf.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/329c83e7-2f30-4607-98b5-92e686b681de/76895627068.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0f8f36a-083d-447b-999b-a12b6e1da820/fantastic_beasts_and_where_to_find_them_cast_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdf07cbc-cfb5-446e-83f5-ff3b8a2663fb/sofubezuvuril.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c987e582-6d4b-424e-8cfa-f7882357c7a5/18787865830.pdfIn PDF document text
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_531ef5aa6a3945b48571951744577c20.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a91da4d-6e63-4d09-906d-df7054739199/kulujazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84b84f80-7d61-4331-af1d-376d3bb57123/how_to_find_your_google_history_on_ipad.pdfIn PDF document text
    • http://toponetivipabar.rf.gd/aster_flower_information_wikipedia.pdfIn PDF document text
    • http://zojasofox.epizy.com/choo_choo_ch_boogie_form.pdfIn PDF document text
    • http://zekerivowula.rf.gd/sloan_flushmate_503_handle.pdfIn PDF document text
    • http://gujugune.rf.gd/the_green_inferno_imdb_parents_guide.pdfIn PDF document text
    • http://jijetebum.epizy.com/bleacher_report_week_7_college_football_predictions.pdfIn PDF document text
    • http://nuxumejaxumem.epizy.com/75129576833.pdfIn PDF document text
    • https://528a8416-53f4-4693-bcf0-540471887af1.filesusr.com/ugd/c3aa89_a155abec9e57410eacfc31f49990aa73.pdf?index=trueIn PDF document text
    • http://lojupefiduk.epizy.com/65631633541.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53ad8c8f-7ccb-4129-ae85-7cc28555f753/tojoxezepup.pdfIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_4e72331a6b77401099c8c02b51a2d370.pdf?index=trueIn 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_off0000df7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7E 5928 bytes
SHA-256: bbe0ff724ca73234ada5ab983584fbd0690a3937d2556d89971419da02151039
font_01_sfnt_off0000f39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39C 10312 bytes
SHA-256: a90e2ca9c041965c5f8698e535d2b46796abdf45ca2c550f8390ce8536f46051