Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cee5ca93fc0baf1…

MALICIOUS

PDF

74.6 KB Created: 2021-02-20 23:44:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f97c71ead8644ee3a1dca7092753b1e0 SHA-1: 6aa7c83dca74ed398eba4f4d3a4c77cefa9220d4 SHA-256: 5cee5ca93fc0baf1b2082dcceeee1986bb847f8f56da163380bc76443f0f69fb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign or a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/strik?utm_term=dbt+emotion+regulation+skills+abc+please PDF link annotation
    • https://cdn.sqhk.co/gefimiwotux/ljfid49/81483243573.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369626/normal_5ff1b431d4384.pdfIn PDF document text
    • http://pinerapidsrr.com/49626859262bqj8k.pdfIn PDF document text
    • https://davijonixumitu.weebly.com/uploads/1/3/5/3/135349017/pozunasoxaz.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/Ogfp1if/reni_crazy_car_racer_australia.pdfIn PDF document text
    • http://detonic-buy.website/mikelinozikujimo4zcjc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474980/normal_5fe01eb459b28.pdfIn PDF document text
    • http://tublitalia.fun/comptia_security_501_study_guideqvwcc.pdfIn PDF document text
    • http://mastericy-chistoty.ru/the_school_for_good_and_evil_character_quizhzpnu.pdfIn PDF document text
    • https://cdn.sqhk.co/girolivudafo/fVidIU5/twisted_wonderland_leona_personal_story.pdfIn PDF document text
    • http://unlockdeals.shop/27267309014jr4jw.pdfIn PDF document text
    • http://salet.store/machine_learning_beginner_tutoriallpc50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481418/normal_600fcbbdbe41a.pdfIn PDF document text
    • http://pubgucbayim.com/jspdf_is_not_defined_angular_5fm697.pdfIn PDF document text
    • https://cdn.sqhk.co/rewakevutel/esNhcgh/fawiwanuratusuxan.pdfIn PDF document text
    • https://tirepululavapiw.weebly.com/uploads/1/3/4/5/134576363/nepesikigel-jelis-salos-fiwira.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366623/normal_601fac6421e13.pdfIn PDF document text
    • http://taygerr.com/osmosis_and_tonicity_worksheet3kfq0.pdfIn PDF document text
    • https://xaxexuwolak.weebly.com/uploads/1/3/5/9/135978614/c3bea441f4ad2c.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/sojaxub/construction_health_and_safety_plan_template_nz.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/airtel_dth_id_information.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_off0000e576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE576 5456 bytes
SHA-256: 45c9a03181b33032d9bb424117702ea5f9c2b987279004567154c55a182fca09
font_01_sfnt_off0000f7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F2 10708 bytes
SHA-256: 51585a1e10e9f5706f72602ef139093bc5c7c8ee5e38cf6cd2b635e7248274dc

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