Malicious PDF — malware analysis report

Static analysis result for SHA-256 6faa6782dd56bca2…

MALICIOUS

PDF

74.2 KB Created: 2021-03-25 13:53:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7775a5278ea50cf52a500af747464bf0 SHA-1: b7eab13156c9a4690bb4b933815f76b7e6482e8b SHA-256: 6faa6782dd56bca271835ed98a1164b281c8b4b327989f709a0e63ad6328b14c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are dynamically generated and point to SEO-optimized content farms. The primary URL suggests a phishing or scam attempt by disguising itself as a search result for a popular ebook. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/wix?keyword=critical+thinking+for+dummies+pdf
    • https://nazemetov.weebly.com/uploads/1/3/3/9/133997276/a36f9f2fa4300a.pdf
    • https://risegexof.weebly.com/uploads/1/3/4/6/134661868/fovaripixoz-matutifukupep-woleladakino.pdf
    • http://pugezesiw.mygamesonline.org/fepabulisika.pdf
    • https://ziresaro.weebly.com/uploads/1/3/4/5/134509830/garukosa.pdf
    • https://pujatimosu.weebly.com/uploads/1/3/2/6/132681823/1407765.pdf
    • https://ralixuviromod.weebly.com/uploads/1/3/5/3/135345966/2863038.pdf
    • https://fejaxipanegis.weebly.com/uploads/1/3/2/7/132712099/geradiwe.pdf
    • https://cdn-cms.f-static.net/uploads/4469841/normal_6054cbf794316.pdf
    • http://vumajufeboxidik.mywebcommunity.org/cnidarios_e_poriferos.pdf
    • https://gojojiwegojefuw.weebly.com/uploads/1/3/2/6/132695574/7943185.pdf
    • https://static.s123-cdn-static.com/uploads/4473916/normal_5ff7a7ee8dcb0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://palomidifigur.epizy.com/whatsapp_2019_uptodown.pdf
    • https://uploads.strikinglycdn.com/files/00c0475e-0193-4097-8630-fa1315b8d597/scholarly_articles_on_sex_education_in_public_schools.pdf
    • https://uploads.strikinglycdn.com/files/dcf75df4-5f3f-4001-a8aa-3ba93a9a7fa4/dell_optiplex_3010_desktop_computer_i5_3470_8gb.pdf
    • http://setevibebevu.epizy.com/98834959332.pdf
    • https://uploads.strikinglycdn.com/files/30daa597-960d-4fa4-a2b9-e04474f6183d/edgar_allan_poe_short_stories_free_download.pdf
    • https://uploads.strikinglycdn.com/files/287cbf44-fb5f-4171-a5ab-c57dfb1f9949/popajiwisixowarinibiw.pdf
    • http://tokavasetalan.epizy.com/68600108151.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e491.bin
a66dc64d5e02aba0e5f236b42221b6cc23814c3c0705b18cf44b6fdfe45b5ed0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE491 5536 bytes
font_01_sfnt_off0000f739.bin
fda86456f9604772db956f2d14fa19f093f07590d6b60d1578c3622626cf2d19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF739 10780 bytes

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