Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5be55a4fd304f34…

MALICIOUS

PDF

74.4 KB Created: 2021-02-19 09:09:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 8591f57ae65dc7d998472d6aee924c3c SHA-1: d413cd094bd16d46c7bf0784b3282d1cd20090da SHA-256: e5be55a4fd304f3489532ed916aa3919b178b32da9403108ecc293afe90f79fb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous external links, many pointing to disposable domains, suggesting a link farm used for distributing malicious content or phishing. The document body, though heavily obfuscated, appears to be a lure related to 'Black Desert character creation guide', likely to entice users to click on the embedded malicious URLs.

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://jottigo.ru/wix?keyword=black+desert+character+creation+guide PDF link annotation
    • https://sevenunoxesu.weebly.com/uploads/1/3/4/3/134341304/mexumo_vojeran_dawafagosigumar_dasasepof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384164/normal_5ffe7fce70919.pdfIn PDF document text
    • https://girusidopot.weebly.com/uploads/1/3/0/7/130738876/aeeb1dba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370319/normal_602ab6dc80471.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451374/normal_60006e5bcfd1c.pdfIn PDF document text
    • https://cdn.sqhk.co/geroterunetu/ibShetk/sagijer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460708/normal_5fef63ef138e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369524/normal_6015bd83714ee.pdfIn PDF document text
    • https://dibapanapuro.weebly.com/uploads/1/3/0/7/130776085/205512.pdfIn PDF document text
    • https://cdn.sqhk.co/duwefetufe/iISQihw/basic_interpersonal_communication_skills_definition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498345/normal_5fd2f8ecbfd87.pdfIn PDF document text
    • https://fuvapevamasazu.weebly.com/uploads/1/3/4/5/134507747/zemulod.pdfIn PDF document text
    • https://cdn.sqhk.co/suxavawudomo/8gf0ies/80818397726.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465545/normal_5feb1ceca38aa.pdfIn PDF document text
    • https://cdn.sqhk.co/fafojipedul/ibhjghi/throwing_knives_near_me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lakonupinazuj.rf.gd/mapigozemow.pdfIn PDF document text
    • http://jenofabejuvokag.epizy.com/bksb_english_level_2_diagnostic_answers.pdfIn PDF document text
    • http://nifekubipaxo.epizy.com/types_of_insect_antennae.pdfIn PDF document text
    • http://kasowudut.rf.gd/mezelenanila.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_off0000e77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77B 5312 bytes
SHA-256: ee9cf485650d443812dd0155419c9b5d9d06d6684d8782ad5f4b34513b40150e
font_01_sfnt_off0000f98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98B 10092 bytes
SHA-256: 1c25fe6a2df9ff7c4e920fc20b41320971b0615ac3041ab7c07ee7b2ad9e88af

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