Malicious PDF — malware analysis report

Static analysis result for SHA-256 8097a51cf65ca1ad…

MALICIOUS

PDF

75.5 KB Created: 2021-04-05 00:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 4d9c85d4f2080955ce84389ac68be0b6 SHA-1: 3eca50fbc442790c89f15cb2f65fd5d88d356d5b SHA-256: 8097a51cf65ca1adc6a1d3b249c966c17bf0bdc779584bc052a950bead2bfe2a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URLs, with a heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://zajinet.ru/award?keyword=research+paper+on+artificial+intelligence+in+medicine+pdf PDF link annotation
    • http://sberhome.ru/how_to_use_oster_breadmaker_model_5838g1cxc.pdfIn PDF document text
    • https://cdn.sqhk.co/wujamufaw/hdUggwa/my_brcc_va.pdfIn PDF document text
    • http://bionatur.space/bozuluxuty0g85.pdfIn PDF document text
    • https://cdn.sqhk.co/veladaxuzeba/hSyjjAu/wuwamizolasibetozuvomopu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451945/normal_6040c29522d37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461481/normal_5fc811d6b4ee3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410191/normal_605b0fdc785f4.pdfIn PDF document text
    • http://copyrightsupportforlnstagram.com/xuromv11y6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409998/normal_604d07b43df0b.pdfIn PDF document text
    • http://rollernefritmassage.xyz/37666169860inrjv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457838/normal_5ffe2b322a761.pdfIn PDF document text
    • https://cdn.sqhk.co/fuludasowipu/icMOgjE/balance_sheet_format_according_to_gaap.pdfIn PDF document text
    • https://cdn.sqhk.co/kipezipilojo/gjnOWcY/titan_ionian_island_paradise.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc83c1e5-fedf-469b-b38a-afb1e3d13955/47424032369.pdfIn PDF document text
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_4fe89520278d429a9ee076fdc233efc9.pdf?index=trueIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_7ada52a197d9421b8d541dcc55c9a288.pdf?index=trueIn PDF document text
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_abc285b1d7d642de8b601f410140c2db.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2c40222-a071-4526-9ddf-13d3de73468e/formatos_de_cv_en_word_2019_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8228907-5f92-4191-957b-add001aedfab/rodanajujasilatawolu.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_off0000e7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D6 5576 bytes
SHA-256: 6198e629ab612cb4dd29df94faa504e78294fe0be04df8b249ba6d502b2502b2
font_01_sfnt_off0000faa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA8 11120 bytes
SHA-256: 1912c98da031e6f9f71654a124b8a96aa854e1ce6d3b220f5ba91008012b102a

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