Malicious PDF — malware analysis report

Static analysis result for SHA-256 17e17746fb26af3c…

MALICIOUS

PDF

79.9 KB Created: 2021-02-28 00:57:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: e59e6469273e6dac2c1630a81a90e3ec SHA-1: 4a7905d074b400663c2da0efe0b55955bb91bb31 SHA-256: 17e17746fb26af3cca60beca27b3a0160d60469b9587979ada325cc99c85027c
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to 'nipisod.ru', suggesting it functions as a link farm or phishing lure. The PDF's structure and the presence of embedded URLs, despite the lack of readable document body text, strongly indicate its purpose is to redirect users to potentially harmful external sites, aligning with spearphishing attachment tactics.

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=blank+map+of+washington+state+with+rivers PDF link annotation
    • http://aslixan.com/slendytubbies_download_2dsi7oc.pdfIn PDF document text
    • http://bapupozizevose.22web.org/how_to_wrap_gifts_without_box.pdfIn PDF document text
    • http://idealicaitaly-ufficiale.site/793856855zyv2c.pdfIn PDF document text
    • http://granitmetrospecstroy.ru/los_juegos_del_hambre_sinsajo_parte_1_netflixuw8it.pdfIn PDF document text
    • http://securityverifiedservices.com/fish_farming_bengali_books9rr5u.pdfIn PDF document text
    • http://idealicaitalia.website/xiroxi1jhnh.pdfIn PDF document text
    • http://ndfnasg.xyz/84616140116s1qxg.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/judubomino.pdfIn PDF document text
    • http://mizebojusur.mypressonline.com/34825907356.pdfIn PDF document text
    • http://allerop.xyz/73069786518ljosi.pdfIn PDF document text
    • http://belplitka.ru/92445817473kh1pb.pdfIn PDF document text
    • http://swast-group.website/10.3_inscribed_angles_worksheet_answers4b9ab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedatowuka.epizy.com/iron_deficiency_anaemia_guidelines_uk.pdfIn PDF document text
    • http://jidofadar.rf.gd/10491666258.pdfIn PDF document text
    • http://numifugok.rf.gd/lizozanufoz.pdfIn PDF document text
    • http://jetumodegupejit.rf.gd/acrobat_distiller_free_mac_os_x.pdfIn PDF document text
    • http://benapubusepem.rf.gd/alexander_2004_full_movie_in_tamil.pdfIn PDF document text
    • http://rupesujutiwu.myartsonline.com/redowirimaderesakebevamo.pdfIn PDF document text
    • http://kulagotano.rf.gd/free_coreldraw_templates_for_brochures.pdfIn PDF document text
    • http://rawigukegopafot.onlinewebshop.net/selututigej.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_off0000fab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB2 5580 bytes
SHA-256: 2cdd68aa8aaf90da877d6b46772fed05e0c9c8b7dc88a9470c71ab9c94bd4546
font_01_sfnt_off00010da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA3 10664 bytes
SHA-256: a0b808fb1788de4e820565d9f05d854e556ca753e095f61151c17cb12d7fb042

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