Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91c9fa6cc438d3d…

MALICIOUS

PDF

77.4 KB Created: 2021-05-09 00:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 0f743682c8dd516138b9790e16ad2572 SHA-1: 42389e33f039c3b85be9affeba8c7bf2f2b54cf1 SHA-256: a91c9fa6cc438d3d79a2a119dae4e4ac94a2d72c4ef409cc5d7f74c52dc55c88
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to disposable domains and are associated with link farm heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/strik?utm_term=what+is+the+best+oral+b+electric+toothbrush+to+buy PDF link annotation
    • http://bestrongbyg.com/skype_launcher_7._40u8wpj.pdfIn PDF document text
    • http://idclick.cash/jefapeleruzavupepewuwe0qzv7.pdfIn PDF document text
    • http://private-channel.site/xeluvuvabxkbct.pdfIn PDF document text
    • http://life-news.tech/wilizemawa9c32w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477864/normal_60313070a4d92.pdfIn PDF document text
    • http://haustova.com/urdu_adab_books_free_download2jvy3.pdfIn PDF document text
    • http://polikarmonolit.ru/siwuwuzabadtbna.pdfIn PDF document text
    • http://kittyplay.online/valvoline_logo5tqv3.pdfIn PDF document text
    • http://rivalo130.com/singapore_math_kindergarten_dimensions2thid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380223/normal_5fc73a0d00357.pdfIn PDF document text
    • http://sekejibugu.iblogger.org/32679158420.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mekavebij.epizy.com/job_costing_methods.pdfIn PDF document text
    • https://d0570615-6cc6-4b78-9a9c-590639bc525b.filesusr.com/ugd/30850e_6417f5da40574048b6200fdf283f5c4f.pdf?index=trueIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_70d268fade5742d9b0cbf41bdf0f0164.pdf?index=trueIn PDF document text
    • http://tifatorebuvu.epizy.com/monalolumupumatuguxezu.pdfIn PDF document text
    • https://ef90beaa-bca2-431e-862c-49c19dd94618.filesusr.com/ugd/06497e_d55bb7c3a6b046ccad69060decdc986b.pdf?index=trueIn PDF document text
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_74c744ef649b4795bdfd8d263c00e247.pdf?index=trueIn PDF document text
    • https://c78ffd2e-fc3d-4272-86ca-968d835fb7ad.filesusr.com/ugd/0f9ef0_1b38d2b06611446bbba166ca2f094e73.pdf?index=trueIn PDF document text
    • http://rubipupajet.rf.gd/cvs_caremark_specialty_pharmacy_refill_form.pdfIn PDF document text
    • http://fewigixof.rf.gd/53623358852.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_off0000f0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F7 5144 bytes
SHA-256: 89dd0ccf4b77a43c9833c411feca9b980c43654a04e4edb193be8c10df00ea2a
font_01_sfnt_off00010283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10283 10976 bytes
SHA-256: 301a4527d28315553cd0379531178e288a664f9f737915aaaeaf43773067083b

Open this report in the interactive analyzer, or submit your own file for analysis.