Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a6af235fcb3357…

MALICIOUS

PDF

72.8 KB Created: 2021-02-14 00:45:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: a861a648845dbf3f521a58c38a81ad08 SHA-1: 99e197e41d48d8890e1d25b7ab81fb42d26557f5 SHA-256: f4a6af235fcb3357c4e126ffdd36f5b2ecbdd0da0205a910c67dbfdc27a5102c
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/123?utm_term=the+confidence+gap+russ+harris+pdf+download PDF link annotation
    • https://davanowaxisipu.weebly.com/uploads/1/3/5/3/135318110/nepelisegomusobojosi.pdfIn PDF document text
    • https://cdn.sqhk.co/pasezateda/egi6heN/vedejuxidawerite.pdfIn PDF document text
    • https://cdn.sqhk.co/gisepavuv/uhagPYv/tokuwiwatoresinon.pdfIn PDF document text
    • https://pelimabogex.weebly.com/uploads/1/3/4/6/134685965/7349272.pdfIn PDF document text
    • https://cdn.sqhk.co/torujazelome/hvlhcmV/lodoma.pdfIn PDF document text
    • https://rupimobo.weebly.com/uploads/1/3/4/8/134891389/6582366.pdfIn PDF document text
    • https://cdn.sqhk.co/depifozopupe/geicgin/best_romance_books_for_teens.pdfIn PDF document text
    • https://joxipoxojig.weebly.com/uploads/1/3/5/9/135956636/segibe.pdfIn PDF document text
    • https://sivenusa.weebly.com/uploads/1/3/1/1/131164431/1652715.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/gifgcuZ/drones_attack_saudi_oil.pdfIn PDF document text
    • https://cdn.sqhk.co/fofotixoz/hVjhAll/lynx_black_cat_hybrid_golf_clubs.pdfIn PDF document text
    • https://cdn.sqhk.co/pimupigedu/Ajbjduv/fractal_space_hd_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/mujowofapubi/ghghggj/mejores_arqueros_a_caballo_age_of_empires_2.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/sesijesule/candy_camera_pc_online.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/79483993272.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_off0000dd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD26 5456 bytes
SHA-256: cdc427b0c4f11db49edd8071a5000ac0542a4774f7f42b5bb0e928aac28f98a8
font_01_sfnt_off0000efc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 11256 bytes
SHA-256: 0857debf14aa492481cfb6459601a1cf7b7ae13b0241293a68df4ada31146f32