Malicious PDF — malware analysis report

Static analysis result for SHA-256 0198d3d568151b55…

MALICIOUS

PDF

76.6 KB Created: 2020-12-29 23:09:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 0b01a1d2a406795164afac5b17f02a3f SHA-1: 3d8244b259be59c00dc7c395475d97f20500d4a4 SHA-256: 0198d3d568151b55a457783c7f9188004956879a7535086c2449fbccb8a2ed3e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

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.
  • 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://trafficel.ru/123?utm_term=funny+i+miss+you+quotes+for+him PDF link annotation
    • https://jerigarapo.weebly.com/uploads/1/3/5/3/135327201/jovupefata-marazupuxuxajak-nekebadopi-kutibexewuputix.pdfIn PDF document text
    • https://wibagubid.weebly.com/uploads/1/3/4/3/134373733/3838276.pdfIn PDF document text
    • https://livadekawa.weebly.com/uploads/1/3/5/3/135317457/datorexeva.pdfIn PDF document text
    • https://rovatelafewi.weebly.com/uploads/1/3/4/3/134392743/1382890.pdfIn PDF document text
    • https://nifirasevaxo.weebly.com/uploads/1/3/4/7/134756957/bukugiwotor-fitedo-puwafo-wonowudamog.pdfIn PDF document text
    • https://gokewulifas.weebly.com/uploads/1/3/4/5/134599519/nowiduvigab.pdfIn PDF document text
    • https://sevimuxeso.weebly.com/uploads/1/3/0/7/130739978/zerivibekewerozar.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/4c179e65-f39d-411b-8f65-074d26c2ab7f/51143470253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/520495e1-3482-48e6-8d35-c0ee0bd780db/pavufifubobibuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eee97398-8291-482c-93e5-b4466920aa64/building_spelling_skills_grade_3_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6742ddf6-60cf-44db-b02c-6853aaca97d7/97997783957.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ac75af0-7469-4430-ae6c-be7b41be8898/36757288859.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d54b4f48-523c-4247-817e-ba1fb4a1e9e8/scott_pilgrim_vol_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1d09a39-8228-477d-a3b7-9f96d7cef2e6/number_1_kitchen_menu.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_off0000eeeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEB 4948 bytes
SHA-256: 019f2508b8b5f681588ccfdf001f6b698117991547e1247e6c1845888fddf708
font_01_sfnt_off0000ffaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAA 11064 bytes
SHA-256: 6f8743b861705d8a881432331e8b648ee70d75168732db1180d7a70d1f093688

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