Malicious PDF — malware analysis report

Static analysis result for SHA-256 b172349521bdd9c1…

MALICIOUS

PDF

71.9 KB Created: 2021-01-21 13:51:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9c42b7160388d753f88aba8393881c95 SHA-1: 433a90764c2b2e35e9ea896f1ac2e7fbbe37da0e SHA-256: b172349521bdd9c13f480b84aac6e77f1f83efb98ff59a954df69c0f65d17114
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'crophysi.ru', and another for a PDF link farm. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious or deceptive content, potentially for phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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=super%20cartoon%20adventures In PDF document text
    • https://cdn-cms.f-static.net/uploads/4492901/normal_5fea145f8b125.pdfIn PDF document text
    • https://site-1085087.mozfiles.com/files/1085087/tijetowedufo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481056/normal_5fe2ef6fa90a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370529/normal_5fce931434135.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478951/normal_5fa6b478372b6.pdfIn PDF document text
    • https://wojopegoguw.weebly.com/uploads/1/3/4/6/134690206/6035028.pdfIn PDF document text
    • https://site-1174463.mozfiles.com/files/1174463/railway_ticket_reservation_form_in_tamil.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/widiku/baby_hedgehog_care_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/29108763097.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/genipovazidisoximebegumow.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/utorrent_free_windows_8._1_32_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/serejiwidevurig.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/unico_powerspin_mx_centrifuge_manual.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_off0000deb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB3 5196 bytes
SHA-256: bd93685ff62611b0d807d8372a5e52a6129e1aec3d85ab40f27aeffaa2254b05
font_01_sfnt_off0000f073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF073 10264 bytes
SHA-256: 84a588ed195aa9fb81ca29675a3d89ae97ada02ad0174d0a5c5919397739d8c6

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