Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa13f2dda8c7a72b…

MALICIOUS

PDF

78.0 KB Created: 2021-05-12 18:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9f569278820100e01576969af5447b9c SHA-1: 7273d772ec3e999fdbfb7f12bec7883edfa8a5af SHA-256: aa13f2dda8c7a72bb5217ff24d1eb6a805e0b10c4f0d1442f501153f150d9923
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, specifically identified as a phishing or trojan variant. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs and the nature of the heuristics strongly indicate an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://vilenefex.ru/strik?utm_term=costco+cannon+safe+review PDF link annotation
    • https://fufagefi.weebly.com/uploads/1/3/4/6/134638184/6213951.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/ihghijb/36104867099.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/7ZCifid/100_greatest_hits_metal.pdfIn PDF document text
    • https://cdn.sqhk.co/jifedibodo/jfIhaje/filmyzilla_bollywood_movies_2011.pdfIn PDF document text
    • http://mamefumiwuto.mywebcommunity.org/9194134575.pdfIn PDF document text
    • http://bidizujimon.getenjoyment.net/rezowudus.pdfIn PDF document text
    • https://bozuzagon.weebly.com/uploads/1/3/4/6/134666742/noketegorulane-sasiwikabukagub-jebidiwimadem-sopazajozowit.pdfIn PDF document text
    • https://cdn.sqhk.co/kixowijeka/ihbF4ih/guideposts_books_pay_bill.pdfIn PDF document text
    • http://sazinoz.mypressonline.com/bipolar_junction_transistor_download.pdfIn PDF document text
    • https://ridegagix.weebly.com/uploads/1/3/4/6/134668883/b7f61b40f4.pdfIn PDF document text
    • https://cdn.sqhk.co/sorubajuzoxe/d2ggWhf/19198907434.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/best_board_game_deals_uk.pdfIn PDF document text
    • https://fajubixinusejeg.weebly.com/uploads/1/3/4/8/134850070/xefopitoka_vegalovopugoke_zokitu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_ec349b13164148199ba638b79790b52c.pdf?index=trueIn PDF document text
    • https://ebbb41b5-b8b7-4bfc-9e1b-23e79ad93844.filesusr.com/ugd/5eba67_c29c7f14c6a04aea80fff1d27404ebec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/how_do_i_fix_my_samsung_lower_ice_maker.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/rockcrok_cake_recipes.pdfIn PDF document text
    • http://nununad.myartsonline.com/husky_26_gallon_air_compressor_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/82803218964.pdfIn PDF document text
    • https://058da8ce-bb30-4b8c-81eb-8903018cac65.filesusr.com/ugd/ab745b_8b4b25cb723a444cb833625dec1e26a5.pdf?index=trueIn 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_off0000f31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31E 4900 bytes
SHA-256: 1cab5f0f8497e88ca892679847c35413735da8860aba158af563c3824ae31325
font_01_sfnt_off000103ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EE 11104 bytes
SHA-256: 2ed554c0154398e0cb4e0ec55cd8bc40954576438a0d4bb3a6a1dcef60f2fe6f

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