Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9a4913eb365c8a…

MALICIOUS

PDF

70.4 KB Created: 2020-11-25 11:16:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d80fd88fbbd54211d9da269b10b88dcd SHA-1: b9ca3879f1e3db82895debb434db9dad2f0b6f71 SHA-256: 7a9a4913eb365c8ade6b7d643ff715ca523853da671917dd4d634c7d70de9cb8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document exhibits characteristics of a link farm, containing a large number of external links to various domains, many of which are hosted on disposable platforms. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs suggests an attempt to redirect users to potentially harmful content or facilitate further exploitation. No scripts were extracted, but the document's structure and embedded links point towards a malicious SEO or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffine.ru/strik?utm_term=scotts+starter+fertilizer PDF link annotation
    • https://duverovimuvojap.weebly.com/uploads/1/3/4/1/134131352/lowifakizalil.pdfIn PDF document text
    • https://xinujulajupi.weebly.com/uploads/1/3/4/3/134321003/21b89ff4183.pdfIn PDF document text
    • https://pukaxonimuno.weebly.com/uploads/1/3/4/4/134435323/sagosu.pdfIn PDF document text
    • https://wevupifusa.weebly.com/uploads/1/3/4/3/134356286/849142.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388183/normal_5f97b37d47d66.pdfIn PDF document text
    • https://lizotolagodega.weebly.com/uploads/1/3/4/4/134495854/zogaxanej.pdfIn PDF document text
    • https://dawifebenunu.weebly.com/uploads/1/3/4/3/134374742/7605344.pdfIn PDF document text
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/4378045.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408335/normal_5fb267f391577.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381748/normal_5f9329c146830.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446289/normal_5fbb5b98caf32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379610/normal_5f8ca90fd484d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367303/normal_5f8ca7fab67bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498801/normal_5fb277e094893.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/felasorarabipis/29373284027.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0D 4712 bytes
SHA-256: 0b2de904b2c64c739c10b0d7ed6030ff817ee0e449b95f05473807a9b83709c1
font_01_sfnt_off0000db17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB17 10412 bytes
SHA-256: 660441aa3fa4fa121d41aa21febc914d7a5c3213982160c25689fdb0d2555da7
font_02_sfnt_off0000fe60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE60 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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