Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe8f92f5857c4ac5…

MALICIOUS

PDF

54.3 KB Created: 2020-11-07 09:47:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 31da87ba2e8443065ce80a6acb0f399c SHA-1: 9bad10ddb03a1ee66abbfb768c449a06e2922a44 SHA-256: fe8f92f5857c4ac5b28ddbbcbfab270a2436c97a89b63187588a0757663d36bb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier strongly indicates maliciousness, and the presence of a link farm heuristic further supports this. The primary URL identified is likely part of the lure or distribution mechanism.

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://traffine.ru/123?keyword=blocked+games+parking+media PDF link annotation
    • https://mikakegurotitu.weebly.com/uploads/1/3/4/3/134309030/gegunaro-finonikumevida.pdfIn PDF document text
    • https://nazuvunu.weebly.com/uploads/1/3/4/4/134438845/9705e15d09.pdfIn PDF document text
    • https://kinojapi.weebly.com/uploads/1/3/2/3/132302846/lugixidonuvatir-kozilezetapafo.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://fivepapovite.files.wordpress.com/2020/11/bitsat_2019_question_paper_with_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3f37b53-b1d9-47eb-be88-b2e6d3132316/fitufedera.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/srimad_bhagavad_gita_in_sanskrit_and_english.pdfIn PDF document text
    • https://dutekosakiwe.files.wordpress.com/2020/11/riworujeruvarigikuga.pdfIn PDF document text
    • https://lofakuserizo.files.wordpress.com/2020/11/82587977016.pdfIn PDF document text
    • https://wirejodumab.files.wordpress.com/2020/11/nixumepoto.pdfIn PDF document text
    • https://xebetok.files.wordpress.com/2020/11/solsbury_hill_sheet_music.pdfIn PDF document text
    • https://zegasaxum.files.wordpress.com/2020/11/33719047116.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_off000085c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85C6 5212 bytes
SHA-256: 9b69aab85575f9aaea163d927654859258a8638b6bc3f2adf2ddd754b17355d8
font_01_sfnt_off00009757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9757 11484 bytes
SHA-256: 8ddc83ee5a399ff5a647f23a7bab63750d1f631ec9f6943892cae329d957e2e7
font_02_sfnt_off0000be75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE75 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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