Malicious PDF — malware analysis report

Static analysis result for SHA-256 a079d0469bfcb1ca…

MALICIOUS

PDF

73.3 KB Created: 2021-01-26 09:43:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 7d710869b6f90c275a3541b44088b408 SHA-1: 23e68c78b32cf9a0b8613d3dad7a028c3f378994 SHA-256: a079d0469bfcb1caeb583dc4cbbb6ebc9b461f4ae3f1b6a010467688d5c0bece
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one prominent URL pointing to 'druttle.ru', suggesting a phishing or malware distribution lure. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support the conclusion that this document is designed to redirect users to potentially harmful sites.

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://druttle.ru/123?utm_term=space+camp+song PDF link annotation
    • http://uchebnoe.website/hide_and_seek_calgary_party_packagessg9au.pdfIn PDF document text
    • https://cdn.sqhk.co/soxoxefumuv/gchdHgj/damobizozopunug.pdfIn PDF document text
    • https://cdn.sqhk.co/jobiwokojo/bjh3jgm/youtube_best_tiktok_videos.pdfIn PDF document text
    • https://cdn.sqhk.co/nigulavax/jhykfie/today_show_live_on_roku.pdfIn PDF document text
    • http://lnstagramverifiedbadgeservice.com/ruritapurimozalujoxinapony3gk.pdfIn PDF document text
    • https://cdn.sqhk.co/xezafube/UShi6ic/wadagetilikopoxaxuz.pdfIn PDF document text
    • https://cdn.sqhk.co/renapudovi/cY1gi8f/sisters_of_mercy_lyrics_this_corrosion.pdfIn PDF document text
    • http://teasmall.space/soccer_ball_bounce_back_net2jc5z.pdfIn PDF document text
    • https://cdn.sqhk.co/netesatova/rgh2Hgi/74502022725.pdfIn PDF document text
    • https://cdn.sqhk.co/ratobomebal/frrUmCm/vasupirilif.pdfIn PDF document text
    • http://sowaviwexurejo.22web.org/addition_worksheets_with_regrouping_3rd_grade.pdfIn PDF document text
    • http://azorocheat1.xyz/binubizz31ps.pdfIn PDF document text
    • https://cdn.sqhk.co/ratijojitud/ie5jfFz/52198846482.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/rizezobabub/evidence_of_evolution_embryology_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/dosipive/muzelokerexiluv.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/jiwagivowuvigutujovuj.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/34940161866.pdfIn PDF document text
    • http://mowigefugitixa.epizy.com/19352196541.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_off0000e0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F2 5228 bytes
SHA-256: 569b0bf83f12e82f1eeecd73fd65680d3ced2c08064d2818110d4c49e63d8593
font_01_sfnt_off0000f2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AE 11052 bytes
SHA-256: 2727b40cf014eed186f290167e9012baa2a956fb1eef439bc5eb46db569b74e6

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