Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddcad28f6e5c8dee…

MALICIOUS

PDF

75.8 KB Created: 2020-12-01 14:47:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f99ed5cb90800aa1ba97d98caa216ee6 SHA-1: 53bef323eb31ea63bf835404c7e82b33de0d3b5d SHA-256: ddcad28f6e5c8dee7ed6a9e1838e8cc0e75587f80d9932637489d1ee2d07d70f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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://trafffi.ru/strik?utm_term=affirming+the+consequent+fallacy+examples PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403143/normal_5f9379e3650ca.pdfIn PDF document text
    • https://jowodetuleguzu.weebly.com/uploads/1/3/1/8/131856173/1139483.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387410/normal_5f9fd2bcd72e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369304/normal_5f90d2d22143b.pdfIn PDF document text
    • https://sujajikozodes.weebly.com/uploads/1/3/1/3/131384638/658e3622f03381.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366995/normal_5f8a6fd631e5a.pdfIn PDF document text
    • https://vukasusig.weebly.com/uploads/1/3/4/3/134349680/foginos-lakuguxetebig.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/tojodepizaduka-wilijabob.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/b0d36749-5c14-45d1-8d52-32765d9246c7/tiny_barbarian_dx_switch.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/budozojaka.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/70361383267.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52835ca0-0eed-4e42-9d94-fd0e93114e1d/84789902706.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc347c00a2757459bf24eac/t/5fc54dcd9d793648403ce162/1606766030169/midavegalinekixowelu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E7 5712 bytes
SHA-256: 41b75e6f5c26b53cbb6ee4163b5e7b129eed1d3093622cc7668fddf628da02f0
font_01_sfnt_off0000e64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64F 11192 bytes
SHA-256: 5c079a4c0a5012a90f4c934cc28db1d49817d366bc32a1943867a814281883d6
font_02_sfnt_off00010c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C92 16088 bytes
SHA-256: c487aa01613208473e3c0b892de3260687b9c0341624d6c76d95d7849508583e

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