Malicious PDF — malware analysis report

Static analysis result for SHA-256 19f9dabfc0e96f6e…

MALICIOUS

PDF

79.6 KB Created: 2021-04-03 07:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 935274490c341899c9d170e0a9e429e0 SHA-1: 23aec9ed7d42e05332b1e22a6de5300a8894249b SHA-256: 19f9dabfc0e96f6e411b71919eb13f4200182bbda9c9a209d800e1b20da3c3d0
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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=what+is+the+lesson+of+the+lion+and+the+mouse PDF link annotation
    • http://pojibuvuj.mygamesonline.org/pibezute.pdfIn PDF document text
    • http://ziwewixowele.sportsontheweb.net/junie_b_jones_read_aloud_book_14.pdfIn PDF document text
    • http://wugegifa.getenjoyment.net/74350115074.pdfIn PDF document text
    • http://vugewanir.22web.org/how_to_write_a_quick_case_study.pdfIn PDF document text
    • http://zeruzatuton.22web.org/jasisivoloralom.pdfIn PDF document text
    • http://norasidifonilov.22web.org/negekifezibefumedove.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/ciencias_naturales_santillana.pdfIn PDF document text
    • http://mibotirekusiw.mywebcommunity.org/avicenna_canon_of_medicine.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvevalor/c34HAtO/game_warship_battle_3d_world_war_2_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzitomizaj/igqiiie/snake_blast_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/joxesinejag/HGjbfmk/soperebinave.pdfIn PDF document text
    • http://nuxipawuxodiwa.getenjoyment.net/aditya_hridaya_stotra_in_gujarati.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/kinusev.pdfIn PDF document text
    • http://mufinofol.scienceontheweb.net/voluges.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovixovuti/jixiehj/zesekoluxosewezije.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kepagewav.atwebpages.com/how_to_check_bp_with_wrist_monitor.pdfIn PDF document text
    • https://79c9c32e-6572-42fd-9c0e-61d057d48a34.filesusr.com/ugd/33a1c8_43d23362a3964e1bb2988139d834ae3a.pdf?index=trueIn PDF document text
    • https://9c3086b9-336b-4a4d-b39c-975a2563a2e0.filesusr.com/ugd/f4f792_5caa12b069aa4355892a3551418fe9a3.pdf?index=trueIn PDF document text
    • https://569e8712-2873-4b93-a654-ea71b6b809e3.filesusr.com/ugd/345929_f898f52cb3f44dd0b65e52b5086d8241.pdf?index=trueIn PDF document text
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_1099206808ae496abfc7b8d9e9698aa0.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA09 5064 bytes
SHA-256: 1f31ae031162bcd03e61cdba6e4bdc1e51592ffd914c3c4462186d2f6951a0ba
font_01_sfnt_off00010b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2A 11656 bytes
SHA-256: be6cccf1a2be7953bd8b254cdfee81d56c72b137f0d6cf64c3d8a8a55f254326

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