Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c1e2bdd5187e05…

MALICIOUS

PDF

81.1 KB Created: 2021-02-11 03:15:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 973c48514d15d42bf4d2066ae6530a45 SHA-1: 6e1252cee3af82b37d1ffa8b60d5871f13cae475 SHA-256: 27c1e2bdd5187e05e85417100360b1885b3e97150ef33ddd6bd989df7de52033
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wb?keyword=catheterization%20procedure%20pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4481422/normal_600ac970a4f70.pdfIn PDF document text
    • https://takadoturig.weebly.com/uploads/1/3/4/1/134108809/dimafakuterek-nepodawosupux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470389/normal_601cdb28b2491.pdfIn PDF document text
    • https://cdn.sqhk.co/wulupumiwi/eidhbiA/vidoso.pdfIn PDF document text
    • http://juxeribitu.iblogger.org/epayroll_system.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476927/normal_600d4a1093b89.pdfIn PDF document text
    • https://lepoboniw.weebly.com/uploads/1/3/0/9/130969744/ginene.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447098/normal_5fecb0b6e1205.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/wusone/christmas_songs_2018_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/73910111920.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/79780428875.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/high_density_polyethylene_sheets_calgary.pdfIn PDF document text
    • http://runoxujozu.rf.gd/imdb_otherhood_parents_guide.pdfIn PDF document text
    • http://katalogo.epizy.com/forcing_chess_moves_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/32288854012.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_off00010442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10442 4988 bytes
SHA-256: d75926ac27a0652b643077756e594b9b2a46e7824653f28f2992ded703f2e447
font_01_sfnt_off00011537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11537 10196 bytes
SHA-256: eb0e2b21fe3acaf346b084d96530366ce1b1a30a9f9af2ee2fd4e0cd54852aed

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