Malicious PDF — malware analysis report

Static analysis result for SHA-256 41916dca0f447f15…

MALICIOUS

PDF

40.0 KB Created: 2020-11-05 18:29:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 632cbcadc2693019526259a6d0f69d2f SHA-1: d3f2e9f36b47b3c7094a1c8973b5059fcbbdc425 SHA-256: 41916dca0f447f156ac30aff7b618999428dd06edc4200b2636ca95b86cdcc2f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 1.0000

Heuristics 5

  • 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/123?keyword=picasa+windows+7 PDF link annotation
    • https://pigogokeda.weebly.com/uploads/1/3/1/8/131857695/zudoxazimepulige.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369643/normal_5f89e3e5eb81b.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/4405868.pdfIn PDF document text
    • https://dabituge.weebly.com/uploads/1/3/4/3/134344098/e8c273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366646/normal_5f924b961902b.pdfIn PDF document text
    • https://gemenudotipetal.weebly.com/uploads/1/3/2/6/132695720/2940162.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450517/normal_5fa233efe11ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408009/normal_5f920a8dd6b23.pdfIn PDF document text
    • https://peketodofow.weebly.com/uploads/1/3/4/5/134589962/2059cab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381344/normal_5f9a6e4573a0a.pdfIn PDF document text
    • https://ditiwudo.weebly.com/uploads/1/3/1/4/131452947/beturasilaji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374540/normal_5f9e10ece68ba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/2779/0496/files/jaropazuxoxonofejije.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_off00006045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6045 4980 bytes
SHA-256: 69cff3f679971cb1cd25a5f5c8eda09ec94afb8734a203b5d09f15f63ef9022e
font_01_sfnt_off00007162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7162 10108 bytes
SHA-256: e98f3707e57b74053b7e62a88e95ef4708c9763c4725c65501fe4486d7fb29b4

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