Malicious PDF — malware analysis report

Static analysis result for SHA-256 182a731d531bd097…

MALICIOUS

PDF

75.4 KB Created: 2021-04-02 05:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 75789ef2a016528cdd3199d4977e82e3 SHA-1: 563829958cd4b68fddb6ce48969d679cd17bd2a6 SHA-256: 182a731d531bd097a2b88ff5156e667c071350b034bbfa1691defde87f9fc2ef
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external URIs points to a website that appears to be part of this link farm. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The combination of these factors strongly suggests a phishing or malicious content distribution attempt.

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 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.
  • 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://leonvi.ru/wix?keyword=easy+clarinet+songs+to+play PDF link annotation
    • https://cdn.sqhk.co/vasinabew/uUgidxV/xikagogebesatifepusisap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419851/normal_60064f08859cd.pdfIn PDF document text
    • https://cdn.sqhk.co/lasanamemego/igjhggt/home_street_home_design_game_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/rowagana/Ngi9hj9/tajebavo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485930/normal_60205ff166844.pdfIn PDF document text
    • https://cdn.sqhk.co/pofoxubo/Cgjhek4/fewisepusumi.pdfIn PDF document text
    • https://cdn.sqhk.co/gokarunedod/jg2gcjh/butepitinuvewibodinuzufun.pdfIn PDF document text
    • https://cdn.sqhk.co/merojuniv/hf0gjgZ/butisitibosojojazazopilox.pdfIn PDF document text
    • https://cdn.sqhk.co/zalenemu/4hgVhh0/88020788860.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426974/normal_60388bcd8213e.pdfIn PDF document text
    • https://cdn.sqhk.co/xakelafu/I5EVjer/fidget_spinner_galaxy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386073/normal_605bf5760a49f.pdfIn PDF document text
    • https://cdn.sqhk.co/fekurisakez/balBpPm/bass_pro_shop_bowling_memphis.pdfIn PDF document text
    • https://cdn.sqhk.co/fedovipawe/jajax7R/77054786880.pdfIn PDF document text
    • https://cdn.sqhk.co/wemitupu/fMQsLKw/12975647670.pdfIn PDF document text
    • https://cdn.sqhk.co/feluxolid/hbjhSji/angular_6_form_control_name.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_54c13a30921c4c20bfeebf8ecac900c5.pdf?index=trueIn PDF document text
    • https://39c10a3a-92c6-412a-a1bb-b8a1fc48fbc4.filesusr.com/ugd/259099_2b80b41cf4d64b8fb8c743533b26bcff.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_off0000e97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97F 5160 bytes
SHA-256: c471d58064c9a54f813ca18953bf2c95b9fb6db7ef08c097f818fa0b12ce4e13
font_01_sfnt_off0000fb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2C 11108 bytes
SHA-256: 72dec8850809477f77088e09b76f8226c3d925b6f6c06f192ccfb86bd3791cc8

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