Malicious PDF — malware analysis report

Static analysis result for SHA-256 163757b68fba53bb…

MALICIOUS

PDF

63.9 KB Created: 2021-02-23 17:45:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: a9851e742ff7de3d92278558db404dcd SHA-1: d325447be028997489a8bfba59821feb01a85630 SHA-256: 163757b68fba53bb149f88b0eaab4044f3dc1ce8f190a6def118c372ecd71d97
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wix?keyword=chat+room+2020 PDF link annotation
    • https://cdn.sqhk.co/wekonexiw/5EVnhd4/served_up_sober.pdfIn PDF document text
    • https://petominezejoza.weebly.com/uploads/1/3/2/3/132303337/8828313.pdfIn PDF document text
    • http://mattelipsticks.site/engineers_black_book_promo_codejnc0d.pdfIn PDF document text
    • https://cdn.sqhk.co/xenumobavun/eKJbJmV/the_advisor_playbook_review.pdfIn PDF document text
    • http://scotiaenlineape-personas.com/66875058293gabh4.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/bisegilupuf/47540311968.pdfIn PDF document text
    • http://jowanesivokadeb.rf.gd/punedu.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/flexible_glass_mirror_sheet.pdfIn PDF document text
    • http://kebafitesulodu.epizy.com/42711101076.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/tutorial_instagram_ads.pdfIn PDF document text
    • https://s3.amazonaws.com/kiremefegonar/16341063444.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/how_to_workout_your_legs_with_weights.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_off0000bf8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8F 4892 bytes
SHA-256: c1effea3981d86ae9350913665112b1df45816631504686bec547c784c567740
font_01_sfnt_off0000cffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFE 10388 bytes
SHA-256: c4a169d8e7018ccfa21df34fac9488be643931a0a492b1890f55e9b3ecbdf089