Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0d80d4c38b9a678…

MALICIOUS

PDF

75.2 KB Created: 2021-02-24 21:33:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 46ff1dd4d02e2e6a53219f647862cca0 SHA-1: ada544e36db51dd56bd5c358ed45fab8c7071f7e SHA-256: c0d80d4c38b9a67844c5ce727a70db037d908b2edded1941c16a7740d7728dbd
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious and contains numerous external URIs, many hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is a link farm, suggesting a deceptive purpose. While no scripts were explicitly extracted, the presence of embedded URIs and the nature of the heuristics point towards a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://jottigo.ru/123?utm_term=plantronics+backbeat+fit+350+pairing PDF link annotation
    • https://cdn.sqhk.co/gujipiror/bVBjeig/bebexusajawetuwemuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476757/normal_5fd792ab8cc23.pdfIn PDF document text
    • https://cdn.sqhk.co/samekikogeri/qxgjSHp/83309848915.pdfIn PDF document text
    • http://tumibejum.iblogger.org/attu_movie_song_mass_tamilan.pdfIn PDF document text
    • http://wuzagabi.22web.org/wulejofisudepidavufusos.pdfIn PDF document text
    • https://cdn.sqhk.co/zevinikiwi/jgicDYY/f1_2020_not_on_ps_store.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443824/normal_5fef5b26d71e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456114/normal_602aa25aad2b6.pdfIn PDF document text
    • http://fogazino.iblogger.org/caitlyn_adc_build_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384644/normal_60203bcc2c950.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414489/normal_5fca6771dfe91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459469/normal_5fcbd8e1c1006.pdfIn PDF document text
    • https://cdn.sqhk.co/zetoxezoza/hicYVib/crossword_jam_app_store.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446496/normal_5ff9cff480f48.pdfIn PDF document text
    • http://zigoramad.iblogger.org/wewifameserotefod.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/oiikj8j/jurassic_survival_island_evolve_apk.pdfIn PDF document text
    • http://jibinomazovujug.22web.org/brazilian_carnival_music_free.pdfIn PDF document text
    • https://cdn.sqhk.co/kawurefeki/9xjggiN/mejipu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413573/normal_60199937553a0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B4 5816 bytes
SHA-256: 322796ff6f458908e2eb2b163ca88a78a0d431505fe60d48ad62c231d09c1453
font_01_sfnt_off0000fa96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA96 10980 bytes
SHA-256: 74f5df8e59fb948ec121d43013f9e6921553f743ffac334057912d0a36e04b24

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