Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf6a0bff537329b…

MALICIOUS

PDF

73.9 KB Created: 2021-02-27 19:11:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 4828511c5948304691d68931a7ae1f31 SHA-1: 15c1f7f60ba56aee899ba6d28abc78dabf660a9a SHA-256: abf6a0bff537329b978433338959db8c9be89d3b64af7defbeebbe0a04932d72
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a link farm pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/award?keyword=the+idiot+book+elif+batuman In PDF document text
    • https://cdn-cms.f-static.net/uploads/4455405/normal_60216458be1d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405907/normal_602c23c8bbad1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426701/normal_600e95480dfe2.pdfIn PDF document text
    • https://noxurawikatiner.weebly.com/uploads/1/3/1/1/131163986/1023490.pdfIn PDF document text
    • https://fobaripiso.weebly.com/uploads/1/3/4/4/134443650/mexojalinijoxor_zajexe_xosugelo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484356/normal_5fce5bd2ca0cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376380/normal_5feb60439a89a.pdfIn PDF document text
    • https://gaxurorilapuw.weebly.com/uploads/1/3/2/3/132302857/2078729.pdfIn PDF document text
    • http://salonapp.xyz/mefixivumenotipio4y05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408004/normal_602ceef028c76.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/niwotipugonuvoz/the_house_on_mango_street_chapter_5_theme.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/imanager_u2000-_b_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/smoke_weed_hd_wallpaper_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/journey_to_the_end_of_the_night_reddit.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_off0000e72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72F 5028 bytes
SHA-256: d84dc6b63634a6b308d70b9612d6b508e1c330bcfacf5e8f473f23ab38795827
font_01_sfnt_off0000f824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF824 10228 bytes
SHA-256: af077cefe30b94aed7688608f24246104279829a3904a5b8c86f22bd6d445e01

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