Malicious PDF — malware analysis report

Static analysis result for SHA-256 121831d214caa4f5…

MALICIOUS

PDF

81.3 KB Created: 2021-03-28 09:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a31cbb636142a1fe41fd12e8a7c792d3 SHA-1: 108c8a6bac7e6ea790117b3c798c23b395077b9f SHA-256: 121831d214caa4f5be58249a6d970b8535894745bae53f17936559f227f292b4
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/strik?utm_term=how+to+increase+brightness+in+casio+calculator+fx-991es PDF link annotation
    • https://vibokijejegol.weebly.com/uploads/1/3/4/7/134756418/3715678.pdfIn PDF document text
    • http://momarivido.mypressonline.com/ryuk_death_note_movie_actor.pdfIn PDF document text
    • https://libepuve.weebly.com/uploads/1/3/1/4/131407284/4009471.pdfIn PDF document text
    • https://kazirevuteguzug.weebly.com/uploads/1/3/2/6/132681824/dafozarizuzivekuduwo.pdfIn PDF document text
    • https://pibezenasa.weebly.com/uploads/1/3/1/4/131454503/8d79d91271a.pdfIn PDF document text
    • https://mogarujatokeduw.weebly.com/uploads/1/3/5/3/135324664/xorugasoj-tukovugapegizow.pdfIn PDF document text
    • http://pimesizawox.sportsontheweb.net/credit_suisse_annual_report_2020.pdfIn PDF document text
    • https://xavexipaw.weebly.com/uploads/1/3/1/6/131636683/rafuxe.pdfIn PDF document text
    • https://lariwajiko.weebly.com/uploads/1/3/4/3/134316624/lafaruri_sijolomovizu_gijilopojamar_kedadib.pdfIn PDF document text
    • http://fikosarodone.medianewsonline.com/moderate_to_vigorous_physical_activity.pdfIn PDF document text
    • https://jimivisimobud.weebly.com/uploads/1/3/4/9/134901817/judipinadurakeka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/figugipopar/dirt_devil_reach_max_plus_cordless_stick_vacuum_charger.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/a_streetcar_named_desire_1951_full_movie_watch_online.pdfIn PDF document text
    • http://watijosanowo.epizy.com/58207179513.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1c83005-e9c7-489b-9331-467e0170a832/xupidixumabekufomuxune.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/xuleduwemufolawisukiwa.pdfIn PDF document text
    • http://pejomozudone.epizy.com/30612049240.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e0b8e3e-20a5-4a2c-9e6c-6ff8970f3c32/manual_de_codigos_control_universal_rca.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ce2ca09-2dea-46dc-a83b-34efd8687083/xosizufofajerixum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63dc734c-af93-40ca-a40a-412de1be1ede/41215353045.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f025161-088c-4f3e-9aa9-742274c840da/dapobititejabajewaso.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_off0000ef4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4D 5644 bytes
SHA-256: 1dc92b1b696ed7cc25174a855c5e60f31c341fd384f376edc3594d806aad2acd
font_01_sfnt_off00010291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10291 1936 bytes
SHA-256: cf50d13c5c21d2e34fba0d9dd21119d4839fc35fdaebfe62cbacf51850cc328d
font_02_sfnt_off00010bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD0 12360 bytes
SHA-256: a62ad28aed8ca083b8814db8c099e65a679bb9c02c80f0b20d8127bd6b42349e