Malicious PDF — malware analysis report

Static analysis result for SHA-256 b353b0b3f000f083…

MALICIOUS

PDF

66.0 KB Created: 2021-02-16 00:36:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9c9400b0bfac9571278cb82a1fb8f8d3 SHA-1: d446c10c001dd05edcf7559d36f61e46178dc0fe SHA-256: b353b0b3f000f083558dc91827680bc5a240bf6e2352ba774b0e5d0fff0d2812
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the presence of many external links suggests an attempt to redirect users to potentially malicious sites, likely as part of a phishing or malware distribution scheme.

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://crophysi.ru/123?utm_term=black+oxford+style+tap+shoes PDF link annotation
    • http://gulakami.22web.org/pitesokug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451555/normal_600ced2def321.pdfIn PDF document text
    • https://cdn.sqhk.co/xufaribo/ylCMihg/track_bike_racing_videos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370265/normal_5fe0a60c0a618.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456378/normal_6008cfe7acb03.pdfIn PDF document text
    • http://kelnoteres.xyz/gapminder_worksheet_answers1e5ri.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407724/normal_5fedab569fa3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471704/normal_5fca384014929.pdfIn PDF document text
    • http://samettemiz.xyz/18332402667yi44r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/billiards_city_hack_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/5449786471.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/vanessa_butterfly_valve_installation_manual.pdfIn PDF document text
    • http://ladorum.epizy.com/36477658241.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/48193915338.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/tekoraj.pdfIn PDF document text
    • http://nazonuretowu.epizy.com/puxetepaniz.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_off0000c31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC31C 5528 bytes
SHA-256: 0f274364d405a547efba6b59c30b00aab65f9fecf091cee6287dbcff9442d360
font_01_sfnt_off0000d5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F5 10816 bytes
SHA-256: 47490201a8ec9d4e0cdf018a135eea400c4725f64ec80b21d571fa1e7c84f9ac

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