Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e7e5041d14aa171…

MALICIOUS

PDF

91.0 KB Created: 2021-04-01 02:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b6b6aab2c39ab1d44aaee19a281c53c7 SHA-1: 56041d0d2b774e3f37993e42c6fdec37714237e6 SHA-256: 7e7e5041d14aa171513e6d0b5344fe4e250d544677abee05a03c4b218888b2b9
146 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, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and contains a callback phishing lure, prompting users to call a phone number. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to trick the user into engaging with malicious actors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://xajibur.ru/123?utm_term=canada+election+party+platform PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457311/normal_5fe695f24b01f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491437/normal_5fc9bba45e1e3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/302c5433-7b9f-4f1b-9df9-b14eeb68848a/rilenokukel.pdfIn PDF document text
    • https://s3.amazonaws.com/furunumaroxun/how_to_bar_a_soldier_from_reenlistment.pdfIn PDF document text
    • http://vodevuparebe.epizy.com/dotiz.pdfIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_0063197e2be94b889c8c1bd103cc452b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a0c5e6d-ea6d-440b-8b41-7c881a5f9524/how_to_program_defiant_electronic_deadbolt.pdfIn PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_b25aeac0c4dc4a47b412f7f888006add.pdf?index=trueIn PDF document text
    • http://jawolaguf.rf.gd/gupelitafepekugal.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/mifudesu.pdfIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_5de1ed7ccbce4bc2b05a0e5e607eae31.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/10ecce68-b34b-47f9-9a43-1b9872cc6845/breville_juice_fountain_cold.pdfIn PDF document text
    • https://9e1bd277-069e-4713-bdcc-1ab96cf790c3.filesusr.com/ugd/5fd2af_3c631c22948a4a52a3ef2a841b9a2e96.pdf?index=trueIn PDF document text
    • http://gofuvosopo.epizy.com/atomic_structure_timeline.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/career_website_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tumuzu/90065621926.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34c69816-e785-45a5-947c-f80c20e97572/how_to_program_honeywell_focuspro_5000.pdfIn PDF document text
    • http://velewetuwo.rf.gd/honeywell_wifi_thermostat_wont_connect_to_internet.pdfIn PDF document text
    • http://lepetape.epizy.com/6th_standard_english_book_guide.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_off000122cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CC 5132 bytes
SHA-256: 56d94a6e066bd90461ada40e4d8f612ab95e61c272cb17ec9af21ad84c5ab0f6
font_01_sfnt_off00013436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13436 12784 bytes
SHA-256: 862569962ef00f867df59ca46476658952409e5fc1c2c460c2082d6dd6892089

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