Malicious PDF — malware analysis report

Static analysis result for SHA-256 a296729fe05f8c8b…

MALICIOUS

PDF

73.9 KB Created: 2021-05-06 10:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd2205b3995e2d648e843384ffb2d3b1 SHA-1: 2417930b9ca47e5da3ca3b1a42d3bfdaeeeb25af SHA-256: a296729fe05f8c8b307e21b4f5a0ae7e8933a4bbda8b729e42064e0d9a79678e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are obfuscated or lead to potentially malicious content, as indicated by the PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS heuristics. The ClamAV detection further confirms its malicious nature, classifying it as Pdf.Phishing.Trojan. The embedded URLs suggest an attempt to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=ao+smith+hybrid+water+heater+specs
    • https://cdn.sqhk.co/bexefoboxevi/1XiejcI/gusewetozoxaxopugeton.pdf
    • https://cdn.sqhk.co/gusoguribus/kiegcja/chess_openings_for_black_explained_free_download.pdf
    • https://cdn.sqhk.co/solijisivono/jA9ZPys/example_of_adversaries_in_a_sentence.pdf
    • http://xatovapotogu.mywebcommunity.org/73345777867.pdf
    • https://burigazipe.weebly.com/uploads/1/3/4/7/134764527/pavowigupad.pdf
    • https://cdn.sqhk.co/fegadosijete/hhjaqSa/old_game_box_app_download.pdf
    • https://cdn.sqhk.co/kubarevopew/dEWeAhb/vomovolifojibawus.pdf
    • https://cdn.sqhk.co/wepurodapike/iejahfO/82900487225.pdf
    • https://wabelurotetef.weebly.com/uploads/1/3/4/6/134693048/cf79006f3ee1dea.pdf
    • https://cdn.sqhk.co/gavezexu/OMRhge2/happy_thursday_orange_roses.pdf
    • https://ridegagix.weebly.com/uploads/1/3/4/6/134668883/gulemafujus-rigir.pdf
    • https://dodoxatufasiw.weebly.com/uploads/1/3/2/6/132681482/dolizajowubomobige.pdf
    • https://cdn.sqhk.co/zazavoxujub/j9RQo7q/nivezewoboxotefujexesa.pdf
    • https://rutikaxa.weebly.com/uploads/1/3/0/7/130738846/5679984.pdf
    • http://pemufosapakem.mypressonline.com/possessive_pronouns_worksheets_preschoolers.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_c76a600d94dd468382aca2d0f7d45762.pdf?index=true
    • https://41fe7446-7195-45c8-906d-de5e784989f9.filesusr.com/ugd/e02969_27e822dba71048338e70eefbfe9ee52e.pdf?index=true
    • https://55f5e71c-5f54-469f-9449-301c43944234.filesusr.com/ugd/bbdb65_c4bf050a00284431aaa814af71ebbf53.pdf?index=true
    • https://02314edc-d025-420b-9d62-795437f25c47.filesusr.com/ugd/4f0fc1_029b7720f103443c89ea41a17d684d78.pdf?index=true
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_6fd5f0dcb5ac4c2fa884ff43d104e925.pdf?index=true
    • 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_off0000e227.bin
ba82c48f5ba87f303c7cf886977a0810879297295776ac1af0d5eae32edac1c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE227 5604 bytes
font_01_sfnt_off0000f517.bin
22a7ce302307376f2a053b1edc464cc3ff41c2a95aa6b5b773e5ff07f7e79fea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF517 10884 bytes

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