Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4cd70d4814c750…

MALICIOUS

PDF

82.1 KB Created: 2021-03-18 21:14:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a442ae7671652a4818d0ddf7475271e1 SHA-1: 3d47810a9bfe38940458dc87bc5f95e86b63c340 SHA-256: 5f4cd70d4814c750076fd8a8a083f5cc040f66b0be9915ea90bc7fa9f1075e36
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/123?utm_term=alcanos+exercicios+pdf PDF link annotation
    • http://zakewabo.scienceontheweb.net/agricultural_meteorology.pdfIn PDF document text
    • http://tuwafanumi.iblogger.org/fefefavowavu.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/9givwdO/red_heart_free_clipart.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/dulenenumitizirorex.pdfIn PDF document text
    • http://rolapisi.scienceontheweb.net/attack_on_titan_manga_chapter_130_release_date.pdfIn PDF document text
    • http://sibogufurab.medianewsonline.com/doluwapazanufe.pdfIn PDF document text
    • http://gufurebu.medianewsonline.com/29109336767.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/ziigiha/67849041993.pdfIn PDF document text
    • http://vudifabofugejij.medianewsonline.com/95815564857.pdfIn PDF document text
    • https://cdn.sqhk.co/waladoved/OgjieF8/zazemoxuxux.pdfIn PDF document text
    • http://mixezitubut.mygamesonline.org/31131569621.pdfIn PDF document text
    • http://gexulogoben.sportsontheweb.net/noxukebasuvex.pdfIn PDF document text
    • http://luvetikemo.66ghz.com/bodyweight_squats_proper_form.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bipaxoxibiva.rf.gd/tatetuwisodikubonet.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/dresden_files_wiki_characters.pdfIn PDF document text
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_d9bbb7dcc09d445084ed9d29b1e3c23b.pdf?index=trueIn PDF document text
    • http://kekerojuxofex.epizy.com/jasijagalepinagamomamino.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/63968852736.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/8942090479.pdfIn PDF document text
    • http://jeborawaleko.atwebpages.com/the_heir_kiera_cass_wikipedia.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/what_is_definition_of_electrical_engineering.pdfIn PDF document text
    • https://s3.amazonaws.com/jupoti/black_hawk_down_book_free.pdfIn PDF document text
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_331bcd7f2edf41269c25f8d8f538f105.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FC 4916 bytes
SHA-256: 518082410f5c1300a948bc7f83c83226f8a1fc401cc10585d7d9cc28c14ca9b0
font_01_sfnt_off000102ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AB 13244 bytes
SHA-256: afccb56be0e240cd2323dcd6dec2d911c9eb54c682736c8f6af44b8fbd2360aa
font_02_sfnt_off00012b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5D 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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