Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a787ef98664735…

MALICIOUS

PDF

89.0 KB Created: 2020-11-14 03:57:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d9a455c46426d0cc7a620e98aaa27fd0 SHA-1: b60fcbca56b289fdc1ce0fbf5dab93f715b2606a SHA-256: 05a787ef98664735d9859baadb6f58dee56b2006db7879e9461b844835b29a25
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting it's part of a link farm designed to redirect users to malicious sites. The embedded URLs and the PDF structure strongly indicate a phishing or malware distribution attempt.

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://traffine.ru/123?utm_term=ryobi+p108+battery+specs PDF link annotation
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/wedidik.pdfIn PDF document text
    • https://zadavutuni.weebly.com/uploads/1/3/4/3/134343582/4083888.pdfIn PDF document text
    • https://lanasasaf.weebly.com/uploads/1/3/0/8/130815311/7488359.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/denusubosokaxem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5f92268b79661.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385010/normal_5f91dac0439f8.pdfIn PDF document text
    • https://jikeberu.weebly.com/uploads/1/3/1/8/131857846/rulomekegezol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388413/normal_5fa386b6600c7.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/beparinunij.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/dofufiri/vusotibokusor.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/16670503834.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_off000108b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B7 5532 bytes
SHA-256: e4d4441ade7ce34ee0724c50a8a559f6c14e03b1051fca196ed6306d6a265e27
font_01_sfnt_off00011ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA6 11252 bytes
SHA-256: f499ccf98b419dfcdf9c87f245d241b19158d236f97bd9ab94c9a49fc59eafc5
font_02_sfnt_off00014244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14244 16060 bytes
SHA-256: 9044de52cb519c95ee67ddce32ea384e940c5cdde4d4dd99e22aebcefe2ca402

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