Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a95a47fdea4bed2…

MALICIOUS

PDF

77.6 KB Created: 2021-03-30 13:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: dfb22d129c0d1781950a1a6452cdfd11 SHA-1: 28dcc6e59d1546e354fa184a5fb754731c11865b SHA-256: 5a95a47fdea4bed2e8f1c5963e79c9d5ae2e8d13f6842adf7b18748227e2c4cf
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF document that contains numerous embedded URLs, many of which point to disposable domains and are indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate the primary attack pattern is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/wix?keyword=t-tess+domain+4+examples+texas PDF link annotation
    • http://baderezu.scienceontheweb.net/aurangabad_smart_city_bus_timetable.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367281/normal_5fdaca4255a55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494433/normal_5fed0d197f26a.pdfIn PDF document text
    • http://wemepena.iblogger.org/40851247221.pdfIn PDF document text
    • http://vavisavig.22web.org/anisotropic_diffusion_in_image_processing.pdfIn PDF document text
    • http://wodunobogigav.22web.org/41365172890.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416930/normal_604693522891f.pdfIn PDF document text
    • http://runufudup.22web.org/mogunusisifaroto.pdfIn PDF document text
    • https://rilulozopofebu.weebly.com/uploads/1/3/1/4/131406258/jusaveledifesigov.pdfIn PDF document text
    • http://vikolumubibo.scienceontheweb.net/encyclopdie_de_la_charcuterie_gratuit.pdfIn PDF document text
    • http://dimopun.mywebcommunity.org/benedetto_cotrugli.pdfIn PDF document text
    • https://wexarasi.weebly.com/uploads/1/3/4/3/134351888/2654471.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
    • http://veraliw.rf.gd/56191503917.pdfIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_86b2c861c04849e0b92fe02348050498.pdf?index=trueIn PDF document text
    • http://pasebuda.epizy.com/bajaj_finserv_wallet_apk.pdfIn PDF document text
    • https://e510c2d5-567e-4a96-89ff-abc18316baf7.filesusr.com/ugd/8a9bcc_a2995c31ce4a46e19b5bb1ba16216f2e.pdf?index=trueIn PDF document text
    • http://mesesoriran.epizy.com/kepef.pdfIn PDF document text
    • http://ledaruwevegoxu.onlinewebshop.net/14033043774.pdfIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_7b200f66639147629462a5fe13543381.pdf?index=trueIn PDF document text
    • https://beca70af-11ea-46d2-a649-d7fd44c468ee.filesusr.com/ugd/dd41e2_37af0f8fae4d4db2a6583e4b7d073c92.pdf?index=trueIn PDF document text
    • http://duwemanuwixam.atwebpages.com/1411872848.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_off0000e646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE646 4932 bytes
SHA-256: 9a42cc7fdc369a4a02a83e2c4ac34b83ecd81359a70dcc008aca63523616c385
font_01_sfnt_off0000f702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF702 10640 bytes
SHA-256: ab73d754e487435efc9bec8254981ecc149c6465a7d90bbc88997f814dd8e949
font_02_sfnt_off00011b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B23 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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