Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4edade4e39ee55a…

MALICIOUS

PDF

81.6 KB Created: 2021-04-28 15:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d38ee1b1fb515b32fdf47445cba927e SHA-1: 852692a528d6fb512977302531f49a781b81ace4 SHA-256: d4edade4e39ee55a6cea5b835de461fbed66e2389ef34786825e117fc884f6ec
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with one prominent URL, 'https://resalured.ru/strik?utm_term=lasko+standing+fan+stopped+working', appearing to be a lure disguised as a search result. The PDF also functions as a link farm, increasing the likelihood of directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/strik?utm_term=lasko+standing+fan+stopped+working
    • https://static.s123-cdn-static.com/uploads/4454999/normal_600385beb32b9.pdf
    • https://static.s123-cdn-static.com/uploads/4409818/normal_5ffa8d824bd88.pdf
    • https://cdn-cms.f-static.net/uploads/4473445/normal_5fe9f1ac4283c.pdf
    • https://cdn-cms.f-static.net/uploads/4459625/normal_604b1fcfb8f6c.pdf
    • https://static.s123-cdn-static.com/uploads/4392860/normal_5fc87d9c77ffe.pdf
    • https://cdn-cms.f-static.net/uploads/4489713/normal_60598d51705d0.pdf
    • https://static.s123-cdn-static.com/uploads/4391308/normal_60045321b97d6.pdf
    • http://lobubomevan.22web.org/best_spoken_english_book_in_tamil.pdf
    • https://cdn-cms.f-static.net/uploads/4421354/normal_6026e09fc9b49.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vetiluxakosimut.epizy.com/how_to_prove_parental_alienation_uk.pdf
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_c011384693354023a90f4c50c5143858.pdf?index=true
    • http://foginuv.rf.gd/newuxo.pdf
    • http://vorasatijede.rf.gd/kovesaxetikiv.pdf
    • https://uploads.strikinglycdn.com/files/0b64ab5a-05e0-449b-a548-70782ae0edf1/xigavibomonivim.pdf
    • https://uploads.strikinglycdn.com/files/422a277a-a0fa-4858-aea2-d7fe133c893e/lesson_10-1_developing_formulas_for_triangles_and_quadrilaterals.pdf
    • https://s3.amazonaws.com/salade/gedowavuxazimoziwes.pdf
    • https://uploads.strikinglycdn.com/files/72a3863b-a2e0-4a51-8b3b-60f28501276d/96575452148.pdf
    • https://0926596c-b1e6-4473-87d6-fed2e709bfeb.filesusr.com/ugd/e2a635_4f0a2f2cb6b14b9dbf87969a94130a3e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1a61b607-84b5-4f69-8723-cc2c9a45a857/quran_with_urdu_translation_and_tafseer_audio.pdf
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_8b143fe20ba34eed98b39ab76a9de784.pdf?index=true
    • https://s3.amazonaws.com/neviwove/avast_browser_plugin_firefox.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff89.bin
f13e83f6e147781a76dd4498bc984148cfe9f87893f725df937d53ad0be06887		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF89 5272 bytes
font_01_sfnt_off000111a9.bin
fb32b09a987f995739021ee0d7ececc983c9171efc25769ce5524011ab826dad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111A9 10852 bytes

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