Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b5470c24970fdf…

MALICIOUS

PDF

70.9 KB Created: 2021-03-12 21:06:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 64a7beef09f49a347d6c72805825e9e0 SHA-1: 3101125a0bb8a366e04e10b5bc9f7929cde54826 SHA-256: d9b5470c24970fdfca8e963b5ae3474c607735f2325011eb32e390d1cbee72c1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving redirection to potentially harmful external content.

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://maypoin.ru/123?utm_term=picsart+png+background PDF link annotation
    • http://najetaxu.mygamesonline.org/diccionario_biblico_reina_valera_gratis.pdfIn PDF document text
    • http://zazorin.scienceontheweb.net/didumedosirizu.pdfIn PDF document text
    • http://tuforuj.mypressonline.com/fibuxuxobobodeminobak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467017/normal_5fdd7f9eb984c.pdfIn PDF document text
    • http://gubixazolela.sportsontheweb.net/47294067440.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458829/normal_60149f0d842f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382771/normal_5fd7a023f1223.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/how_do_you_convert_julian_dates_in_excel.pdfIn PDF document text
    • http://tilikef.mygamesonline.org/noco_genius_g750_charger.pdfIn PDF document text
    • http://gatowixipeba.mywebcommunity.org/4691585637.pdfIn PDF document text
    • http://ferafukapawap.scienceontheweb.net/xt-43lcd_programming_instructions.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_5563eeb0c6354950b8ab9f87664cbf5a.pdf?index=trueIn PDF document text
    • https://dc383e6d-b7a3-4e67-a88a-227fa542b6c3.filesusr.com/ugd/72b0e7_50719e190ba64ac6aa8a078f1e1f3fc8.pdf?index=trueIn PDF document text
    • http://seroroxunabolu.onlinewebshop.net/95411837049.pdfIn PDF document text
    • http://jalijoruki.atwebpages.com/spiderman_coloring_pages_printable.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CC 5412 bytes
SHA-256: 1cc61305684ed3dd1fd65af97c4624be1be3af9e1bc8f1d0de3b73b15c5d4fe6
font_01_sfnt_off0000eb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB41 10592 bytes
SHA-256: 47823cc7189129d7dba2c9195c530e75a2f2cefd29eacead4ca02c2281ecb756

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