Malicious PDF — malware analysis report

Static analysis result for SHA-256 a059253d3dd3b2a5…

MALICIOUS

PDF

94.1 KB Created: 2021-03-15 19:16:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c4d24de4f4738b2eb3602528db1a7b5f SHA-1: 14d739358c93ee6f69b1c50020296ab7c5079abc SHA-256: a059253d3dd3b2a561868ca61f6cb9ea313f83f60be484b3243d291d901a4dd2
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The document body, though heavily obfuscated, appears to be a lure related to 'Siddhartha discussion questions answers', aiming to trick users into visiting one of the malicious external URIs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kuzutuzo.ru/wix?keyword=siddhartha+discussion+questions+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407576/normal_603d7209e644f.pdfIn PDF document text
    • https://cdn.sqhk.co/lewivapawo/fOO1hdN/71477550122.pdfIn PDF document text
    • http://fiwisud.getenjoyment.net/65286120530.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389095/normal_60299dde54ce9.pdfIn PDF document text
    • http://dfwshootersupply.com/puwagazalermmyir.pdfIn PDF document text
    • http://shtangelkipokupkiitd.online/88992526275z9gqk.pdfIn PDF document text
    • https://cdn.sqhk.co/fusureviweki/RsjeU0q/persuasive_writing_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/retakabif/w3t9the/17222408010.pdfIn PDF document text
    • https://cdn.sqhk.co/tekonunise/hbWwhji/smart_goals_for_students.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445869/normal_602ba0c5864ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377408/normal_5ffe2552217d4.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/xetipujujuwevurazuges.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410201/normal_600b9a9c8bd7b.pdfIn PDF document text
    • http://sks-expertiza.ru/feeling_good_carly_rose_sonenclar_sheet_musicdb1zk.pdfIn PDF document text
    • https://cdn.sqhk.co/pibepufas/jdgdie6/64985371363.pdfIn PDF document text
    • http://premium-cinema.com/gisamejogagedejunq3px.pdfIn PDF document text
    • http://raisinsapp.club/the_water_is_wide_bookarrcy.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzitomizaj/igdSn6W/98407721746.pdfIn PDF document text
    • http://vevaxogejaz.scienceontheweb.net/pnrd_advertisement_2020.pdfIn PDF document text
    • http://libralab.digital/suvidofeguadd9h.pdfIn PDF document text
    • http://ita-bio.fun/97523736172appog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tediguku.atwebpages.com/15140073683.pdfIn PDF document text
    • http://nevabaza.atwebpages.com/best_english_learning_books_in_india.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_off000134d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D1 5316 bytes
SHA-256: 543e0d3d1c758a4ad0f04e0631eb59d16394305c783ca5bda5d61d023c7eafee
font_01_sfnt_off000146ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146ED 10572 bytes
SHA-256: 106864bb2fa42f66d2a45803d2be2f400b74fa2470d6e0248b56035a397fcd76

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