Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0e233b5861548b1…

MALICIOUS

PDF

64.0 KB Created: 2020-11-20 04:23:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f4108d1975b419c2ca4c4cfa582d83a5 SHA-1: 9a1add37caa3f71eb0d4251acf9df956d448df92 SHA-256: a0e233b5861548b1f76a9d52efe8caa213145dd41bbe941713b1baa6155a43fb
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the PDF structure and embedded links are designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://traffine.ru/aws?utm_term=best+birthday+song+in+kannada PDF link annotation
    • https://vikumeniwexawud.weebly.com/uploads/1/3/0/9/130969440/belaj_rijega.pdfIn PDF document text
    • https://muxosafexokole.weebly.com/uploads/1/3/4/4/134485240/8336330.pdfIn PDF document text
    • https://miwilokak.weebly.com/uploads/1/3/4/3/134375457/4950010.pdfIn PDF document text
    • https://worozimovazez.weebly.com/uploads/1/3/1/4/131406108/dipisulemu_muzifaratudoxo.pdfIn PDF document text
    • https://bipinutafo.weebly.com/uploads/1/3/4/3/134358532/5f2d1.pdfIn PDF document text
    • https://zatazonikafude.weebly.com/uploads/1/3/4/3/134340422/zunisipasefonaxadibu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388596/normal_5f8e079d3eac7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387921/normal_5fb4b670d0c9c.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/99330797-144a-4294-89e9-a5e7fa953a0d/associa_property_management_sarasota.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/9886969814.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e17f5f08-575c-47bf-a62b-92894de9aac5/summer_olympics_basketball.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_off0000b5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F4 5408 bytes
SHA-256: 77afbf25ae90b91985434e46a0582e9fe945624da15a057cd6805dd58027b0b2
font_01_sfnt_off0000c857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC857 12784 bytes
SHA-256: 154b9c5d58732acff239fa0ca9af244f6216e407556444e2086905d6fa84d830

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