Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ffda2e36054605b…

MALICIOUS

PDF

77.6 KB Created: 2021-04-02 19:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a44cd3e1cb90f924d0aea8774e6c42a9 SHA-1: c2892e4cfa569d273e3f76378408845e2fcfe53d SHA-256: 7ffda2e36054605b34edbe3677405eb3acf86be9192fb7bdd7cdefaf9b672f77
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to disposable hosting, and is described as a link farm. One prominent URL, https://midufefew.ru/strik?utm_term=best+cheap+riding+lawn+mower+2019, is likely the primary lure. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/strik?utm_term=best+cheap+riding+lawn+mower+2019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403816/normal_600fd92d7338b.pdfIn PDF document text
    • http://xisumagogali.getenjoyment.net/73059072745.pdfIn PDF document text
    • http://dawexefif.getenjoyment.net/romeo_and_juliet_essay_prompts.pdfIn PDF document text
    • https://cdn.sqhk.co/wirujurumugi/hcidjc6/siemens_cnc_programming_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416664/normal_6047707857300.pdfIn PDF document text
    • https://cdn.sqhk.co/fudopalizew/bl1hbs6/ronanazutedosevo.pdfIn PDF document text
    • http://canlisohbetim.net/color_psychology_in_marketing_and_brandinga5y8q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458826/normal_5fe9a05d539a7.pdfIn PDF document text
    • http://fito4ka.xyz/60311443696bxwci.pdfIn PDF document text
    • https://cdn.sqhk.co/puxolika/hcjjRrB/17755105590.pdfIn PDF document text
    • https://cdn.sqhk.co/famagafe/hijcAMM/94035628027.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/0ccb546e-551b-4d4d-b62f-3a3b7395fe10/best_self_help_books_2021.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/how_to_drive_an_automatic_car_step_by_step_video.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/9687782265.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/091d4760-5618-48e1-9af3-916def6ebd8b/crown_xti_4002_manual.pdfIn PDF document text
    • http://tavamikilav.myartsonline.com/clapping_music_app.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_off0000f080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF080 6108 bytes
SHA-256: 51246fe65f2900888ed8b98a35ff585b61199cdecbd100b0afa22f123c5fd2e9
font_01_sfnt_off0001053e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053E 10616 bytes
SHA-256: 7e55d4352d723e9d502709dbe36a78977d33761c530b7cfb5ce6695c92f098ab

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