Malicious PDF — malware analysis report

Static analysis result for SHA-256 0993470e41c62264…

MALICIOUS

PDF

76.5 KB Created: 2021-05-02 20:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 3faf5c8d9b442c10a9ac54a6cb35f4b4 SHA-1: 271e8a813dc1910f4e9fa81de18e47e26bf27b60 SHA-256: 0993470e41c62264ba2d3b3021224ba46921262d1fc89ddd4b3c382e7c9c9a32
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 pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the presence of numerous external URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://druttle.ru/strik?utm_term=best+book+to+learn+visual+basic PDF link annotation
    • https://guwawafike.weebly.com/uploads/1/3/5/3/135338161/patokafuburo.pdfIn PDF document text
    • http://vutajazelige.medianewsonline.com/ponem.pdfIn PDF document text
    • https://gusijanuvo.weebly.com/uploads/1/3/0/8/130874241/desobajetumozuguxe.pdfIn PDF document text
    • https://lofefogurabu.weebly.com/uploads/1/3/1/1/131164054/giguvolore_wipekatarakawaz_wikuzoxorotulu.pdfIn PDF document text
    • http://zereteleriw.getenjoyment.net/5013241075.pdfIn PDF document text
    • http://natnat.fun/english_book_class_12_download_state_boardlurbv.pdfIn PDF document text
    • https://jixerunoxeza.weebly.com/uploads/1/3/4/6/134678785/bozonubew-guzufaputejebut-tukowedowefabek-sofosagisivemat.pdfIn PDF document text
    • http://stav-games.ru/online_business_card_maker_free_printableq3nsg.pdfIn PDF document text
    • http://copyrightreports.com/discurso_de_xv_aoshbq0w.pdfIn PDF document text
    • https://vuzazaba.weebly.com/uploads/1/3/0/8/130813658/3350986.pdfIn PDF document text
    • http://negedibomul.sportsontheweb.net/gabab.pdfIn PDF document text
    • http://nadipewin.mywebcommunity.org/building_drawing_symbols_and_abbreviations.pdfIn PDF document text
    • http://vimobewawulipiz.mypressonline.com/dowry_prevention_act.pdfIn PDF document text
    • https://sajofagexureleb.weebly.com/uploads/1/3/4/6/134652103/5974852d6f97.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_c5e787a99f214ec9bd5c070ca1d8ffff.pdf?index=trueIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_4239024b09a84a8f93cfee28acd38bb1.pdf?index=trueIn PDF document text
    • https://eeeff038-21f9-42a6-bde0-cd945221d618.filesusr.com/ugd/9dc459_7d414ce4d877478e818adb14357fe667.pdf?index=trueIn PDF document text
    • https://f187853a-68e6-4ed6-a420-9593b89d6738.filesusr.com/ugd/27c34a_7419196d26174fd78fc44036fbb9ab98.pdf?index=trueIn PDF document text
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_7866ef31e8fa452a85bfdb06068e149f.pdf?index=trueIn PDF document text
    • https://01ff271a-2d66-4e22-ac0f-a796646d2f56.filesusr.com/ugd/8d93e9_d9a992da0c0846cf92a4c7c77341582f.pdf?index=trueIn PDF document text
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_f148f071ee634359801d39875e12feec.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_off0000ee53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE53 5108 bytes
SHA-256: d9c87a5174cca70154ad5770167830a1980f1f3f7b05d2debfc93a5d2f23cfa0
font_01_sfnt_off0000ffca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCA 10956 bytes
SHA-256: 419b1d23d83f44cdc962532a7181c72d330893acdad3fe3cfbbd75d05f077f14