Malicious PDF — malware analysis report

Static analysis result for SHA-256 d93f0e0d52274474…

MALICIOUS

PDF

74.3 KB Created: 2021-03-28 10:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1f3f69cf9266b99aaf0bd93c521cdcc3 SHA-1: c3a119573880a866e8888713f2288587ef7b14dd SHA-256: d93f0e0d52274474f36e2cd9d512f3be0eb9200eacfecc46889a27e006bfcfaf
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous embedded URLs, with one prominent URL pointing to a site that appears to be a link farm designed to redirect users. The document body, though heavily obfuscated, contains text related to 'apush leq prompts reconstruction' and the authoring application 'wkhtmltopdf', suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/wix?keyword=apush+leq+prompts+reconstruction PDF link annotation
    • https://pilinasovoda.weebly.com/uploads/1/3/4/1/134132167/fusinuzalag.pdfIn PDF document text
    • http://telovajov.medianewsonline.com/printable_wedding_budget_checklist.pdfIn PDF document text
    • http://bugilinupapud.mygamesonline.org/38674910491.pdfIn PDF document text
    • https://cdn.sqhk.co/xezafube/i3xIEjf/tedugojerarelunokaxuzifar.pdfIn PDF document text
    • http://xupulakikovuxo.mypressonline.com/what_is_the_third_step_in_the_decision-making_process_brainly.pdfIn PDF document text
    • http://miwuzobi.sportsontheweb.net/nafta_certificate_of_origin_fillable.pdfIn PDF document text
    • http://gapagal.mywebcommunity.org/30548313786.pdfIn PDF document text
    • https://cdn.sqhk.co/xenojepezere/tha0ggs/tic_80_music_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/fapolokid/iW6ljbA/breadwinners_menu.pdfIn PDF document text
    • https://tinubabitem.weebly.com/uploads/1/3/4/3/134361694/5ddbe3d22cf70.pdfIn PDF document text
    • http://jixazepo.mywebcommunity.org/beauty_and_the_beast_stage_manager_script.pdfIn PDF document text
    • https://piwirajaluz.weebly.com/uploads/1/3/5/3/135312697/bc1ad.pdfIn PDF document text
    • https://menekagamop.weebly.com/uploads/1/3/4/0/134097565/82f3e2a9.pdfIn PDF document text
    • http://vejefulolite.22web.org/perceived_wellness_survey_questionnaire.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/trigonometry_formula_class_11_in_hindi.pdfIn PDF document text
    • http://famirasavu.epizy.com/do_not_despair_quote.pdfIn PDF document text
    • http://wenimawibi.epizy.com/diablo_2_inventory_mod_plugy.pdfIn PDF document text
    • http://lupibewexuzu.rf.gd/maven_netbeans_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/53918994532.pdfIn PDF document text
    • http://gexegubiduw.atwebpages.com/77730324828.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62C 5080 bytes
SHA-256: 1a9d4de65ae59e95b4090513a744136bad48875e2017687b02e0ed048828fd76
font_01_sfnt_off0000f751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF751 10596 bytes
SHA-256: f445e8f3537e046067444d3886ce853948a6fb6248f699fb1504d04f13dff1a8

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