Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b2b36e9fe110eb…

MALICIOUS

PDF

93.3 KB Created: 2021-05-24 14:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b9b216845bcdf65869078d7bfbc3a031 SHA-1: 21f5b1d423b782ef93d48d6f8285b8ce4c9a4f40 SHA-256: 63b2b36e9fe110ebe57822d5784b34baf8695d02072f96134280c6bba5e15282
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of an SEO link farm designed to redirect users to other documents. The primary redirector URL is identified as a lure for free downloads, suggesting a phishing or malware distribution attempt. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://lozipotod.ru/strik?utm_term=2000+kawasaki+prairie+300+service+manual+pdf PDF link annotation
    • https://pepodefaposuv.weebly.com/uploads/1/3/5/9/135992330/purivomefo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447263/normal_603ef4eab5b19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450434/normal_5fec2475e8c33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478125/normal_5ffdebf8c9155.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388177/normal_604cf191a48a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378405/normal_6041622406cec.pdfIn PDF document text
    • https://legorigerelok.weebly.com/uploads/1/3/6/0/136056749/2553217.pdfIn PDF document text
    • https://ponawexem.weebly.com/uploads/1/3/2/7/132740185/kufefuf-kosofutewexas-lajawideto-dalubotude.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/jiwotarotavuz/is_aisin_transmission_fluid_good.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/17974096722.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b4cbeb2-3259-4dbe-81e6-72889d576e5a/last_of_the_mohicans_streaming_vf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9306d2df-2224-4d43-ab1b-86f36c5da003/antique_tappan_stove_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a26e5785-22d8-42ba-bb0d-9a925e90e497/manual_de_funciones_de_una_empresa.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/reinforced_concrete_design_worked_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c85dc99-e6e7-4244-ae79-0379a869463b/73283874861.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6fd1c96-7163-4825-97e6-8419de2544eb/gokulutunijegekisatud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee2fc0b7-c033-45b2-ab85-a59961adfffc/pojekadeliximizaduxamup.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/english_grammar_lessons_video.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/adkar_sabah_wa_masae_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f527b35-379a-4d72-9319-29bc9e02228d/53379163360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d74700af-ec3c-498d-942d-b6023eecec63/53258935434.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/fuvakevatukumet.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/how_do_you_fix_a_toro_personal_pace_lawn_mower.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/fixuxuj.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/89741032939.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb7382a0-f803-44ee-a6ea-2ef7dc849939/gotejikunikarawof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8996806d-963e-4467-95f8-4484a694dc5c/craigslist_northern_michigan_travel_trailers_for_sale_by_owner.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11616 5860 bytes
SHA-256: 1b457d623399d480f6e1c9a614b5bd0fea781c51b55cf038e96592a6e0c660f8
font_01_sfnt_off00012a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0F 10944 bytes
SHA-256: ba4cc1a172bf5fce5cddef1e04c8fcac21760f096445f6f57ac0177c9b31ba62
font_02_sfnt_off00014fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FCD 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501