Malicious PDF — malware analysis report

Static analysis result for SHA-256 c256a0dd73466cf0…

MALICIOUS

PDF

75.7 KB Created: 2020-12-25 20:09:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 32ff38aeb7a01a25ca02326c9ca3b1b0 SHA-1: acbd878289a4efab5132f01272eb82dbaaeedd31 SHA-256: c256a0dd73466cf01a170aaea3560a2a45555b13096222493f49f8ab83e60b06
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffe.ru/aws?utm_term=emacs+org+mode+cheat+sheet PDF link annotation
    • https://cdn.sqhk.co/norifasil/qbjhgiD/wilojigajipunesevagoz.pdfIn PDF document text
    • https://sububavujowiv.weebly.com/uploads/1/3/4/4/134460245/lenosirorejuki.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/ruxozukozuvazu.pdfIn PDF document text
    • https://bexitapanirid.weebly.com/uploads/1/3/0/9/130969950/joxuturinalolo.pdfIn PDF document text
    • https://zoveponezewuda.weebly.com/uploads/1/3/0/7/130738822/6594323.pdfIn PDF document text
    • https://jolaxedepodoz.weebly.com/uploads/1/3/4/7/134708869/kudeton-vogeto-sidulerefijuj-fizoloresigupib.pdfIn PDF document text
    • https://suduvigil.weebly.com/uploads/1/3/4/6/134697429/8567724.pdfIn PDF document text
    • https://cdn.sqhk.co/panosiritu/whgEid5/dunabavijogutevuwekuseveg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/700808e5-fbf2-47fb-8d61-9045e7c1e688/29381884614.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8b808dd-15b1-4979-97d4-3687cfd1d3b9/angle_of_elevation_worksheet.pdfIn PDF document text
    • http://orgmode.org/org.htmlIn PDF document text
    • http://orgmode.org/orgcard.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_off0000e6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C2 5280 bytes
SHA-256: aed62c853aacde1633003ca970c5554d0e7f59bf0c21331c495b9acaba51d550
font_01_sfnt_off0000f881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF881 12332 bytes
SHA-256: c8c1c866e1fce3b9ab25eced7e9020e279cc006d2a4c6251da0d83a16453a0e2