Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d0d9fbdf9950c36…

MALICIOUS

PDF

91.4 KB Created: 2021-05-29 07:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1bb7284dbe3175f5c948e44a61c0060c SHA-1: 4b55f49c364666be735d73b3bc882ca235dcaba1 SHA-256: 4d0d9fbdf9950c3638dae2f48be76279f9986b3b4952b0088c1adac58330f720
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The primary URL, https://soxebez.ru/strik, is likely part of a phishing or malware distribution chain.

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
  • 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://soxebez.ru/strik?utm_term=crucigrama+respuestas+de+ejercicios+complementarios+3er+grado+bloque+4 PDF link annotation
    • https://kemivepume.weebly.com/uploads/1/3/1/4/131407144/tekonovunoni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416665/normal_602f9c7609f11.pdfIn PDF document text
    • https://lotimameligibim.weebly.com/uploads/1/3/4/2/134235738/fubopiputogubi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377902/normal_604975cf7ca35.pdfIn PDF document text
    • https://voluwunuzusiju.weebly.com/uploads/1/3/1/4/131452861/8404317.pdfIn PDF document text
    • https://xizotikozuza.weebly.com/uploads/1/3/4/5/134587863/sawikakavivenulamose.pdfIn PDF document text
    • https://tibaxasunoz.weebly.com/uploads/1/3/4/5/134589804/rivikidoted-falixen-dulojutuxu.pdfIn PDF document text
    • https://gesogakit.weebly.com/uploads/1/3/4/5/134581759/4506304.pdfIn PDF document text
    • https://wagebesalumiral.weebly.com/uploads/1/3/4/8/134846814/580bd69b6702.pdfIn PDF document text
    • https://wupugosow.weebly.com/uploads/1/3/1/3/131382590/92fa51874a7add.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459481/normal_6047788f4c70a.pdfIn PDF document text
    • https://xeravatiwawu.weebly.com/uploads/1/3/4/6/134603636/nipevajizinenewepab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409000/normal_5fcc28e7e9d68.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/c822afde-e7af-454c-836f-b49fa595acbd/xowopusogimedid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9083677c-7fcf-4e58-8d86-830b33512b2b/icebreaker_games_for_youth_about_love.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31bcc62b-73d8-4967-979b-d5483a598eed/vapenikosofijav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44b5473b-d246-4a7b-bd06-7dd851c9489f/79279348119.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae818ce0-e1ca-4cc5-82eb-1d5cb017d87b/best_casio_tough_solar_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2824a5d0-2c5a-45b6-aeea-6d9108b63aa7/kulefutoxogazudukim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98dc5a12-247d-4641-bd4d-28804c7d2542/dan_brown_lost_symbol_book_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a7af88b-e9e0-4c5e-8b5d-968c660d6367/lukamopixofonajogumabijag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c78585f-39e8-4f12-b1a0-f2d884b2382b/how_to_set_up_water_softener_timer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5ed4a5b-7366-4c79-8ce3-9b11aaa782f4/tigivev.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_off00011e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E59 5892 bytes
SHA-256: 2e40eca24d90d664f3c5542440ef7876952d83164b31473077591dba36c52e0d
font_01_sfnt_off00013252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13252 13400 bytes
SHA-256: 24635acada987804953aeb65799530d6e7675211cb35bd0f8a625cd953c4a22d