Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2ef05eb56e0efea…

MALICIOUS

PDF

82.5 KB Created: 2021-03-18 23:59:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9dbead3e256aef97d8917a710a760005 SHA-1: 168b4ffb00283477828b78700bfe60110fcaa494 SHA-256: e2ef05eb56e0efea459549e4e4c51b628ba5cb4c30c088938f50459490f67470
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/wix?keyword=vtech+telephones+manual PDF link annotation
    • http://testrun.ru/kevelofafabevih6cwy.pdfIn PDF document text
    • http://aicberg.net/ejercicios_de_quimica_organica_nomenclatura_grupos_funcionaleswb8og.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/J6lJxji/bawujetemeje.pdfIn PDF document text
    • https://cdn.sqhk.co/wajuletixex/5jddPNS/homescapes_full_gameplay.pdfIn PDF document text
    • http://wirelessinfo.ru/velocity_vs_time_graph_slope_motionz7t9a.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/kosamupim/8249308662.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/41005567271.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f61d9ce-c3ed-4f66-9e5e-74150811f32d/55159585369.pdfIn PDF document text
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_8b4958763c5b40f8bba50a00548dd711.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5263a1e1-80d6-41e0-86bc-28e9c7c121c5/rarurelafopesetapudenuwiz.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/grid_website_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gusule/business_plan_template_app_startup.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/suxuvo.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/vivonejara.pdfIn PDF document text
    • https://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_6a65dad3489947038dea0503ec4e8ecb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c249352b-17e9-4473-85ef-cf7dccc7d013/what_is_literary_tone.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/92270563636.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/40426355096.pdfIn PDF document text
    • https://9e7b01ce-91ce-414a-93c5-ade8df4b7359.filesusr.com/ugd/cfbfd2_1dc4479520a94aacbf67d384074e9ad2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wutogugej/bekadutaxejogarix.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_off00010580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10580 5040 bytes
SHA-256: 7326a1962a01c9f5824969d7d0ef706797b3d186b151514041410286b8719e25
font_01_sfnt_off00011684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11684 11292 bytes
SHA-256: fc1ea6588cc44a07b1086e754dad919f795af67e3618939485061f97a378569f

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