Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9c50cfc4407ad4…

MALICIOUS

PDF

90.4 KB Created: 2021-02-26 18:11:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 005735744583f80c83bfbc16c7284b1d SHA-1: 74a9500596a1d4a1942e391450a106bc6ad2f215 SHA-256: 4f9c50cfc4407ad4b755a1d758d7ebadb1178757d2bd18b3f777eece9164702c
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains and flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/wb?keyword=how%20to%20clean%20a%20bersa%209mm PDF link annotation
    • http://redit.fun/wesojibodebezuwavagugonyjkfc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459483/normal_5fc5a3ba5bdcf.pdfIn PDF document text
    • http://xepidenad.scienceontheweb.net/what_are_examples_of_capital_budgeting.pdfIn PDF document text
    • https://pagopolekabob.weebly.com/uploads/1/3/4/3/134305888/1f3e2b7342a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410695/normal_60054ba37789f.pdfIn PDF document text
    • http://nakanilo.club/zowowakonivumegoxusapumer59gik.pdfIn PDF document text
    • https://joxefumisati.weebly.com/uploads/1/3/1/4/131406837/mapinitukutewejaxez.pdfIn PDF document text
    • http://dvertsoff.ru/zokonidagajakawpteq3.pdfIn PDF document text
    • http://nugekurobeju.iblogger.org/coursera_deep_learning_course_free.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/60926983451.pdfIn PDF document text
    • https://jevizaja.weebly.com/uploads/1/3/4/8/134869407/pakagefavivemeg.pdfIn PDF document text
    • http://kufafukedexepix.mygamesonline.org/which_graco_stroller_is_best.pdfIn PDF document text
    • https://vonenefanor.weebly.com/uploads/1/3/4/6/134638091/xefugigol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guruwemuzotal.epizy.com/kakuxopevebafodetor.pdfIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/65226320505.pdfIn PDF document text
    • http://vagakidid.epizy.com/how_fast_is_a_yamaha_fz6.pdfIn PDF document text
    • http://nejarisiwudu.atwebpages.com/192000784.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7D 5292 bytes
SHA-256: 86261efbdea6e9a820543d6741f637627671ef6f1f6e3e0d009cf3f02b394149
font_01_sfnt_off00011f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F71 11224 bytes
SHA-256: d3b4a8d69527484a3f37a756ca0e12e740ebb164be353c36a7f2c9e0277803c6
font_02_sfnt_off000145f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F6 16424 bytes
SHA-256: 1613997550337182b0b615cd5cd9185109ff23057fc77deaae10b9e63e46f2a4

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