Malicious PDF — malware analysis report

Static analysis result for SHA-256 25385b60ba0fd4b6…

MALICIOUS

PDF

99.8 KB Created: 2020-11-24 12:55:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: de11789815ec37e859a8386c5543e03e SHA-1: 91db738ed59eeda22ae5015f09f3ea28e1f59820 SHA-256: 25385b60ba0fd4b6e2cd9b22ede040d2ad940e95e67ac39fcb150471c4dc96cb
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://traffking.ru/123?utm_term=long+days+journey+into+night+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476758/normal_5fb4b166ce2a0.pdfIn PDF document text
    • https://jokojizo.weebly.com/uploads/1/3/4/5/134509913/8360746.pdfIn PDF document text
    • https://dukutisanag.weebly.com/uploads/1/3/4/3/134318107/zowet_rojodagatabid_mafanegaredegob.pdfIn PDF document text
    • https://kubuwexujilo.weebly.com/uploads/1/3/4/4/134473085/47fdf376.pdfIn PDF document text
    • https://wikazire.weebly.com/uploads/1/3/0/9/130968935/8aedfa5c0.pdfIn PDF document text
    • https://samomalekadoj.weebly.com/uploads/1/3/1/4/131438786/zivavo.pdfIn PDF document text
    • https://jinukomerum.weebly.com/uploads/1/3/4/5/134587773/8077841.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450878/normal_5fb3c7e837ac7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382638/normal_5f8b4fb8c752f.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://uploads.strikinglycdn.com/files/df58520b-89c8-4b0c-87d3-a3704ecfd659/38856476023.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52ddb7fe-58d7-40fd-afa6-1e0f4a6c2515/kajidebunijowadedijisiro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f7a0db0-d05a-4474-9882-88dd5e2e8d90/97831271372.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4B 28448 bytes
SHA-256: e01fdb8b3998b609eaac3549ec9ae96263a8f67a7e4b86009a0da47011165703
font_01_sfnt_off0001256b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256B 5272 bytes
SHA-256: 246a3ce6786ae3412ff7284213bad5333b97aab565ab79dd95a5073d1ab2e08e
font_02_sfnt_off00013767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13767 11316 bytes
SHA-256: d272159e8dd8b272e315f985dae1ff4d67abe356d446d9d4c25baf485cd0c085
font_03_sfnt_off00015e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E2B 16316 bytes
SHA-256: a2d115f0f97de8ad79ff358ffc77a456361852623a062a0fc59f2585ee3261ce
font_04_sfnt_off000173ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173BA 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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