Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f5c93e5e9b6290…

MALICIOUS

PDF

73.0 KB Created: 2021-03-31 04:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 260d0a78be632f6c67abc0f81da9232e SHA-1: 4129cb7db2f3584ec756eb8bdcaf9a1df097d1ff SHA-256: 99f5c93e5e9b6290b18a85abb25ffac4c4c8226ea394e0137bb785db07a40a2f
126 Risk Score

Malware Insights

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

The PDF contains multiple external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the presence of numerous URLs and the heuristic findings point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/123?utm_term=chuy%25E1%25BB%2583n+t%25E1%25BB%25AB+file+%25E1%25BA%25A3nh+sang+pdf+online
    • http://zarabatyivat.ru/morugifokudikotuzejtm216.pdf
    • http://lololoj.sportsontheweb.net/xuvudebutevozerufom.pdf
    • http://malanefire.sportsontheweb.net/19652938735.pdf
    • https://static.s123-cdn-static.com/uploads/4426822/normal_5fe01656081de.pdf
    • http://nadefememidep.medianewsonline.com/42919903388.pdf
    • http://kafalukuwemi.mygamesonline.org/30302173987.pdf
    • http://snapchat-alert.com/lujudofilolimensypk0.pdf
    • https://cdn-cms.f-static.net/uploads/4470961/normal_6022178a4381d.pdf
    • http://bu-markett.com/python_strategy_pattern_runtimehk0up.pdf
    • https://cdn-cms.f-static.net/uploads/4369507/normal_604404bccdfdc.pdf
    • https://cdn-cms.f-static.net/uploads/4418175/normal_6057032b8a866.pdf
    • http://wojesukuzak.mygamesonline.org/cisco_wrt160n_v2_specs.pdf
    • https://cdn-cms.f-static.net/uploads/4489407/normal_6054ce81ddba1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jelunegizubu.atwebpages.com/2423771470.pdf
    • https://s3.amazonaws.com/kijelopazekune/adobe_reader_installer_free.pdf
    • https://s3.amazonaws.com/sinadi/rules_for_assigning_oxidation_numbers.pdf
    • http://laxukumelukadut.myartsonline.com/nisafogibifo.pdf
    • http://kulebosux.myartsonline.com/normandin_menu.pdf
    • http://vumamuv.myartsonline.com/ncert_maths_class_12_solutions_download.pdf
    • https://s3.amazonaws.com/matogapibelifiv/brazilian_blowout_safety_data_sheet.pdf
    • http://bagugexasorip.myartsonline.com/13561040152.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_off0000d379.bin
be1539a9140d7517c580c6f886da800b2a6c18b7498d6eb2c2c65a2b677cc3a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD379 5844 bytes
font_01_sfnt_off0000e685.bin
1584a34bc11b85a60fdd72f22688961e8d9803f2236bc1b7606faff0091cdf5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE685 20212 bytes

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