Malicious PDF — malware analysis report

Static analysis result for SHA-256 43cdbf4f81dbe560…

MALICIOUS

PDF

83.6 KB Created: 2021-03-31 11:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ed2bdc47d4d8b215c67c7c5b6ebfc30 SHA-1: 7aaa91723f95632d7588181d9e2dd9a27cd64dec SHA-256: 43cdbf4f81dbe560774ce785bfde792ad2fb59873eb77b51ccb3e2bcbcf15b32
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a "link farm" designed to direct users to other PDFs. The primary URL, https://mezovuduw.ru/wix?keyword=unblocked+game+sites+2019, suggests a lure to disguise malicious intent. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of phishing or malware distribution.

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-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://mezovuduw.ru/wix?keyword=unblocked+game+sites+2019
    • https://static.s123-cdn-static.com/uploads/4375708/normal_5fe0580a55f6f.pdf
    • https://cdn.sqhk.co/fipexuwebo/moiggjh/nafus.pdf
    • http://sutivetowit.mypressonline.com/central_park_guillaume_musso_gratuit.pdf
    • https://cdn.sqhk.co/wukikanas/Igjjaia/beteregumajikuzisavaf.pdf
    • http://mofemaruwek.sportsontheweb.net/active_directory_tutorial_windows_server_2020_r2.pdf
    • https://cdn-cms.f-static.net/uploads/4460233/normal_6026c9f9db269.pdf
    • https://static.s123-cdn-static.com/uploads/4452587/normal_5fc706cff1246.pdf
    • https://cdn.sqhk.co/puwukuwos/JidMhbq/90798283406.pdf
    • http://vobajujabu.mywebcommunity.org/bilusujapizemesib.pdf
    • http://mejumeroxara.mywebcommunity.org/20371516445.pdf
    • http://lifolibi.sportsontheweb.net/forms_of_e_commerce.pdf
    • https://cdn.sqhk.co/pixorikibam/ebGJtgc/zasivukipe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gozifep/vojoxomazuvimadewevipegi.pdf
    • https://s3.amazonaws.com/xujitezu/conduction_convection_radiation_multiple_choice_questions.pdf
    • https://s3.amazonaws.com/xeroguru/luguxiretuteledog.pdf
    • https://s3.amazonaws.com/bovenotojitowe/macbeth_free_with_line_numbers.pdf
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_1ddf4bd963aa4e2a8c8e25a7bbe88590.pdf?index=true
    • https://s3.amazonaws.com/wewiro/mobo_market_app_store_apk.pdf
    • https://s3.amazonaws.com/wefadep/hp_deskjet_2131_not_printing_black.pdf
    • https://e9abb47e-19e5-4ec2-9f3c-2aa4e6f2bf0a.filesusr.com/ugd/92be99_7bd66345529a4bdba7e184593e2d12cc.pdf?index=true
    • https://s3.amazonaws.com/zonebon/zamakejurudaziguteva.pdf
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_3010d9ffa7ca476fb72e77da984abfc9.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_off00010970.bin
5deb6bd04d81aa87509a6521650a9a15041911e0b4145cd58c23102f21fbdbb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10970 5840 bytes
font_01_sfnt_off00011d47.bin
bc5546ed6a24564aef85c5889bc4bca911f8c61ea9890a5dc4129f75670180fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D47 10520 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.