Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb171b32f76a033…

MALICIOUS

PDF

70.9 KB Created: 2021-02-26 02:43:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 73775a4759eee352d8e3ad73f527743a SHA-1: e8e2e01df8c2394006ae08770a47f73f4da5fff6 SHA-256: bfb171b32f76a033e08cb40df4980c1111174c6c78798832238763bf0295a147
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://baarspo.ru/award?keyword=note+4+screen+replacement+cost+south+africa PDF link annotation
    • https://cdn.sqhk.co/wuvexudid/gNMiJjh/granny_square_afghan.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/eLjc8hj/masudapatelu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464996/normal_6035060cc9757.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/0hj4fsl/big_bang_theory_penny_last_name_2015.pdfIn PDF document text
    • https://cdn.sqhk.co/xixujipum/dMGjfhj/worst_game_ever_reading_comprehension.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369518/normal_5fe8048a42726.pdfIn PDF document text
    • https://xabetibupu.weebly.com/uploads/1/3/0/7/130738966/kowuweriduxono.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465905/normal_5ffb806b01301.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459629/normal_6006688f25f38.pdfIn PDF document text
    • https://cdn.sqhk.co/pusobatosip/xhahehf/weekend_weather_forecast_for_philadelphia_pa.pdfIn PDF document text
    • http://titanovyi-filtr.ru/guxugibikezutb1lg.pdfIn PDF document text
    • https://cdn.sqhk.co/regavebike/idiajaf/48493229742.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485589/normal_602ce4b25ed23.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451021/normal_5fcf4b90763c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427519/normal_5fcb175084ba7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD864 5312 bytes
SHA-256: e35d4484fff7f865f9138bd7fffe3d299d0c049ba4921c3053b0b942da0e63bb
font_01_sfnt_off0000ea55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA55 10660 bytes
SHA-256: 6aa77bb9eca29818351886d32e7a7e81c2258fd0602990464bbce6261b7e7dad