Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aca20d462b83ece…

MALICIOUS

PDF

77.6 KB Created: 2021-04-12 22:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55aea7b36a1dd82c6834731ef9939a97 SHA-1: 2160a52e3fa523a10983d070d8944c07b097ced3 SHA-256: 2aca20d462b83ece594ae6e703c82c507443ab08b31a3d80c0d5f69ec276b442
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://kuzutuzo.ru/strik?utm_term=how+to+reset+jawbone+mini+jambox', are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • 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/strik?utm_term=how+to+reset+jawbone+mini+jambox
    • https://fobibopokigafo.weebly.com/uploads/1/3/4/7/134702456/zazowit-xawisi.pdf
    • http://linunewilut.mywebcommunity.org/automation_anywhere_user_manual_download.pdf
    • https://jirafaribov.weebly.com/uploads/1/3/4/5/134599686/mosasa_gepidusisebimiw_puxelagorawoxo.pdf
    • https://jotesufuxave.weebly.com/uploads/1/3/1/4/131483421/lixezijuwabuxu-sexipagob.pdf
    • https://static.s123-cdn-static.com/uploads/4472182/normal_60019ec7c9444.pdf
    • http://dodajavux.scienceontheweb.net/13631430746.pdf
    • https://jurozujuzofu.weebly.com/uploads/1/3/4/8/134875655/5103939.pdf
    • https://xivafotipumi.weebly.com/uploads/1/3/4/3/134322080/6342566.pdf
    • https://wokumedepawal.weebly.com/uploads/1/3/4/6/134607606/4071992.pdf
    • http://rerixen.scienceontheweb.net/non_verbal_analogy_test.pdf
    • https://cdn-cms.f-static.net/uploads/4454545/normal_6054ed4cd50e0.pdf
    • http://juroxeferesapok.iblogger.org/tijodid.pdf
    • https://tozusasulinun.weebly.com/uploads/1/3/4/8/134872335/wudosa.pdf
    • https://static.s123-cdn-static.com/uploads/4404297/normal_5ff13daed422b.pdf
    • https://rebazizezasij.weebly.com/uploads/1/3/4/5/134586802/f39375eb79b1c8.pdf
    • https://cdn-cms.f-static.net/uploads/4446285/normal_603a6ae4ead10.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xutenasejubibe.atwebpages.com/cant_stop_wont_stop_book_free.pdf
    • http://jezagap.epizy.com/62282995670.pdf
    • http://botetuvixomidiz.epizy.com/thomas_calculus_10th_edition_solution_manual.pdf
    • http://kanemotix.rf.gd/47307880851.pdf
    • http://memamawu.onlinewebshop.net/17645256821.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e716.bin
d0cbd741b3a1ab6038ccfdd364acb4b4d955b4618f85e689e8a1f026ec1ecc1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE716 3288 bytes
font_01_sfnt_off0000f2da.bin
605922145d4d5f3d64d495820d45c6844e5cfa586ce4bf832ca3041e0cfc5af1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DA 5136 bytes
font_02_sfnt_off0001044f.bin
07e3d22d99f232b268b9b895fa38b3f8aedc459cde881418c77a8c040bfe516e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1044F 10772 bytes

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