Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccfece838391c39a…

MALICIOUS

PDF

83.0 KB Created: 2021-05-29 18:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ff49a3db3e54780fa42b5ab6ca8357a8 SHA-1: 55a908df626ffc7968091f796a4281d99d7c14e0 SHA-256: ccfece838391c39aa1eebd5d7ede20f67b056db22b3a8afaf588c38c1182276d
176 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. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • 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://jumiwimov.ru/123?utm_term=basic+physics+book+for+diploma+pdf PDF link annotation
    • https://xezixopizanew.weebly.com/uploads/1/3/5/3/135314636/3b3441b0.pdfIn PDF document text
    • https://nagopajasire.weebly.com/uploads/1/3/4/3/134311949/100188.pdfIn PDF document text
    • https://ramowofotaro.weebly.com/uploads/1/3/1/6/131607053/romivekevexodofuzuv.pdfIn PDF document text
    • https://wivetagimogik.weebly.com/uploads/1/3/4/6/134618772/f8de8dfaf.pdfIn PDF document text
    • https://ronewomiz.weebly.com/uploads/1/3/0/8/130874064/96d132513.pdfIn PDF document text
    • https://jutoxanifi.weebly.com/uploads/1/3/5/3/135321179/xigekefe.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/b8b58a93-2de4-463f-9a7f-0cedcd8e1fd9/31067903858.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9273938-b785-409a-ae3d-ae8341d87ba4/1758079320.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/010efc58-b7d2-4589-8265-0055a352ad12/car_dealership_business_plan_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6e502cc-18a3-4694-9819-68bfa9e2416d/old_town_i_pilot_kayak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f2cb8e3-6b69-479a-ab48-575fcf64b6fa/how_to_write_a_case_study_essay_for_social_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66f3691e-a3d6-4920-87cf-572eb6fdac71/62827942159.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7524b117-3b8e-48da-a4b0-29abad87de65/fadisugisewebivifugonoxiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b00d260f-d8be-4b56-bec5-586c6af83ad8/scientific_method_lesson_plan_high_school_biology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b757e22-d25c-434d-ba8a-1cbeedb092f1/how_to_study_for_cpc_certification.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01781253-5fff-4bdb-9cd6-d25a3aa23cba/cyberpunk_2077_dlss_settings_reddit.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_off000105f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F1 5748 bytes
SHA-256: 7ea8af8517b641aa8919be585fe4bf7e6ad834a0ff2dadde74539bba1aaa9ba9
font_01_sfnt_off0001195c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195C 11096 bytes
SHA-256: 3b8227d8e8e26e016288040c96ef3b48f94bedbdb439cb7fb257ee69b5709104

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