Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba0dcc184d330d4…

MALICIOUS

PDF

76.3 KB Created: 2021-05-06 04:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 023ff9a20f621132b306ce18b8daa6a1 SHA-1: d9ffcb7fb6e26c9afd607e7ccacac7fece30d560 SHA-256: cba0dcc184d330d4d3c7c2fe9d0452062763796012aff7a37bd67fb7166612e6
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which are on disposable hosting, suggesting a link farm designed to redirect users to potentially malicious sites or phishing pages. The document body, though heavily obfuscated, appears to be a lure related to 'Sulzer pump manual book', aiming to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/strik?utm_term=sulzer+pump+manual+book PDF link annotation
    • https://cdn.sqhk.co/bilexodofose/Zjhsvql/word_vs_color_test.pdfIn PDF document text
    • https://cdn.sqhk.co/nesadatifu/CqzBpic/hidden_escape_lost_temple_walkthrough_chapter_5.pdfIn PDF document text
    • https://cdn.sqhk.co/riraxizilob/ihiihia/36091177308.pdfIn PDF document text
    • http://gizaxeredemuni.22web.org/autocad_architecture_2020_tutorial_deutsch.pdfIn PDF document text
    • https://cdn.sqhk.co/parabeset/jjcl2jg/bajuzerijibagib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482618/normal_6041ca4583778.pdfIn PDF document text
    • https://cdn.sqhk.co/kegetaxob/chggcjb/wafera.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451352/normal_5fe6fd2fd0bcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379371/normal_6046b75f62fc0.pdfIn PDF document text
    • https://cdn.sqhk.co/givogaduta/jgjbI8o/birthday_cake_ideas_for_female.pdfIn PDF document text
    • https://cdn.sqhk.co/wifurovud/gegchiO/71145351881.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zuses/61824486726.pdfIn PDF document text
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_eac239c0b6564abd9fa583e7089806b2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/bartleby_the_scrivener_full_text.pdfIn PDF document text
    • http://vilulew.rf.gd/75784847504.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/corrugated_galvanized_sheet_metal_home_depot.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/annadata_bengali_full_movie_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/rainforest_leaves_template.pdfIn PDF document text
    • https://0ef2f354-78a3-4528-990c-72f69c86fc6a.filesusr.com/ugd/6a0da6_07563986b5534dddbe79277730d8f778.pdf?index=trueIn PDF document text
    • https://b7c6a474-53ed-4139-af63-4b2f501ae0e7.filesusr.com/ugd/e87294_7ed0f8c1158148f58ea39134336eb58a.pdf?index=trueIn PDF document text
    • http://sakoperuranabij.rf.gd/zilunuw.pdfIn PDF document text
    • https://fd7a53fe-11c1-4e60-83ad-ac1bb997268f.filesusr.com/ugd/5cf23b_7585cac7f4e04294b24cc6e8adf5c43c.pdf?index=trueIn PDF document text
    • https://c63359c4-faa5-40af-ad11-254ddd3d100c.filesusr.com/ugd/838c33_60708f3fe1394938b13289753c1f5f7e.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_off0000ec36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC36 5144 bytes
SHA-256: 2cc47f103f05510da30f5cda122b11b991c0dea82719c91675c8bdc1f85af498
font_01_sfnt_off0000fda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA1 10752 bytes
SHA-256: a80e59c21808fd2cf6a612509e9221c9d0146228b4584eb68f38b598a7728cac

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