Malicious PDF — malware analysis report

Static analysis result for SHA-256 37115aa060ab379b…

MALICIOUS

PDF

139.7 KB Created: 2021-04-03 02:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 59c1bf85d936563f34873165a8f60191 SHA-1: 84cd94ec3b4b6e3ed2a26051218dc0f614b51cdc SHA-256: 37115aa060ab379bdc967521c1f4607c7fc81e7ad2542aa99d8bf2b50a2ab969
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and heuristic firings point towards techniques used to obscure malicious content and redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/award?keyword=cyrano+de+bergerac+pdf+ita PDF link annotation
    • https://cdn.sqhk.co/zoluwumenad/eduRmgi/95841609008.pdfIn PDF document text
    • https://cdn.sqhk.co/tirabipati/VWuichf/dexubimegikegoxo.pdfIn PDF document text
    • http://nakodinita.scienceontheweb.net/schwinn_recumbent_bike_250_replacement_parts.pdfIn PDF document text
    • https://cdn.sqhk.co/wavefekus/YieqIpz/bam_bam_bole_dj_remix_song.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476758/normal_5fcc74e6be686.pdfIn PDF document text
    • http://paselon.getenjoyment.net/ullman_introduction_to_automata_theory_languages_and_computation.pdfIn PDF document text
    • http://fofumumitem.medianewsonline.com/fidunigajat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499282/normal_6031d17109e29.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464527/normal_5fcd7eee8c259.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408984/normal_6022be8cbd56b.pdfIn PDF document text
    • https://cdn.sqhk.co/gixelotopa/giek3DG/wasorubulugotibizuzogaku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389108/normal_6018a16353e55.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/5Jw6V2l/hit_tha_roof_testo_e_traduzione_speed_gang.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://f0ded7c6-1882-44c2-b580-3fd8daacf182.filesusr.com/ugd/1cd4ca_54df9821e41d4bc18a8c345b2b145655.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/70498496997.pdfIn PDF document text
    • http://zikoliduxa.atwebpages.com/effective_c_book.pdfIn PDF document text
    • https://e1318bff-d970-45e2-bcea-45481503a18b.filesusr.com/ugd/75a96d_5cf5f637dc7245d9ac413d2bca09e83f.pdf?index=trueIn PDF document text
    • https://41d9b059-0b17-466b-96e6-f31a3f3e9b19.filesusr.com/ugd/f1ead9_caf17f519bc2423c9d4ae60b791357ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/povodijirig/86799413926.pdfIn PDF document text
    • http://dufojamimusim.atwebpages.com/58604507808.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001da99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA99 5164 bytes
SHA-256: 42aa507d65a3ce1dd3c1f6560063314871d0c9cb785d9fd9c82b71a9f0d797d4
font_01_sfnt_off0001ec40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC40 11924 bytes
SHA-256: 8df74b99e8b90ac02ec1418ae0eac1e8931c49bee4923f079eb420fb3440773e
font_02_sfnt_off000212d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x212D5 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f