Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83100b8a2c9f4c8…

MALICIOUS

PDF

43.5 KB Created: 2020-11-08 12:23:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5b6ac2d8f3816f0f00c7a2ff0d99f870 SHA-1: 83d591021690432a82c428ad7d2fe460cf131fb4 SHA-256: a83100b8a2c9f4c8fcbf804855cc8be449c1402950402ade3b5f2484c3cee5fa
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many of which point to disposable hosting and appear to be part of a link farm. The primary URL, https://trafffi.ru/123?keyword=blindness+jose+saramago+pdf+full, suggests a SEO spam or phishing lure. The ML classifier strongly indicated maliciousness, and the structure points towards a malicious link farm designed to distribute further content or lead users to malicious sites.

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=blindness+jose+saramago+pdf+full PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368222/normal_5f8bf37c2bc0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422638/normal_5f989e596130f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406213/normal_5f943a776cf79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379384/normal_5f8db7c9180a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382405/normal_5f98b8ca9307e.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/sidubirofip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://romekelisefo.files.wordpress.com/2020/11/nitunawikudaremutujozudok.pdfIn PDF document text
    • https://rifipaxosavi.files.wordpress.com/2020/11/6034159658.pdfIn PDF document text
    • https://gopalov.files.wordpress.com/2020/11/51172652866.pdfIn PDF document text
    • https://radusawis.files.wordpress.com/2020/11/towezojiguvujibatuxumotiv.pdfIn PDF document text
    • https://wotenopofe.files.wordpress.com/2020/11/budixaw.pdfIn PDF document text
    • https://kolinaxud.files.wordpress.com/2020/11/clash_of_clans_hacker_download_no_survey_no_password.pdfIn PDF document text
    • https://nolelefe.files.wordpress.com/2020/11/69016096729.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_off000068ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68AC 5488 bytes
SHA-256: 19891396f0cf9b5050db737d79d43fa0f40b10d37255bde436780a8d4c627eca
font_01_sfnt_off00007b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B4B 10952 bytes
SHA-256: 05b96a4fb28752569b269047701f1c5d916d5103a040992c730ce99376e77dee

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