Malicious PDF — malware analysis report

Static analysis result for SHA-256 79db0df3c97b6a8b…

MALICIOUS

PDF

76.6 KB Created: 2021-03-24 17:04:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4c2c4ba22b596c089752bd80e6ac8338 SHA-1: 03328d195a016fdf4bfdb06189d0c36c893ce555 SHA-256: 79db0df3c97b6a8b742eaa352966e4e71b8ee7fcac01745e903413f2c19e5244
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous external URIs and embedded URLs pointing to disposable domains, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains keywords like 'Asbog exam study guide' which likely serve as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dugedepap.ru/wix?keyword=asbog+exam+study+guide PDF link annotation
    • http://siondez.ru/10129432140ubko6.pdfIn PDF document text
    • http://ig-copyrightviolation.com/8344355413lg9zb.pdfIn PDF document text
    • http://tadidavazutopa.sportsontheweb.net/88710269625.pdfIn PDF document text
    • http://hookup756.fun/oceanhorn_2_switch_release_date9g6br.pdfIn PDF document text
    • http://latitekiwa.scienceontheweb.net/nba_basketball_court_dimensions.pdfIn PDF document text
    • http://trells.space/64831994429yz6rc.pdfIn PDF document text
    • http://rawenspant.online/92327803676ahcsl.pdfIn PDF document text
    • http://ruluzuzadol.mypressonline.com/41014228518.pdfIn PDF document text
    • http://organicnu.info/las_cloacas_del_periodismo_reportajefngle.pdfIn PDF document text
    • http://mpvideo.org/jonumaxoxexexijagerovedraxnl.pdfIn PDF document text
    • http://fogejebimo.scienceontheweb.net/fakajojidita.pdfIn PDF document text
    • http://am-sound.ru/83611216012bcwti.pdfIn PDF document text
    • http://7lessons.space/how_to_do_pen_and_ink_wash1ktyh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lewinozed.atwebpages.com/bpc_sap.pdfIn PDF document text
    • http://zitasixan.atwebpages.com/sedifujovotexu.pdfIn PDF document text
    • https://45180a89-8b92-4d54-a4c6-cdf0ad6af3c7.filesusr.com/ugd/2b98a3_c6c09b512e214a0a8fb2309dd05c4243.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/65512405106.pdfIn PDF document text
    • https://86f5e18a-8766-4ae7-b9bf-31430b627380.filesusr.com/ugd/911c12_945a1c37952b4154b55148542765a4d7.pdf?index=trueIn PDF document text
    • https://fa5d8e44-005d-4c05-925d-ba60cb7f5023.filesusr.com/ugd/121e37_cd9e84c1109d49bca01a69a5304d3b66.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tafogusegabomu/dewefejutemuwar.pdfIn PDF document text
    • https://bc5ba30c-e427-49eb-abc4-9677f18f04c1.filesusr.com/ugd/bcd086_7fdb11088d014f9fa254c3c8824773e2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/kafaduleguzidaxofed.pdfIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_fdf67d3954e64f43aca44aae8f93e9cd.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_off0000eef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF8 5316 bytes
SHA-256: 621e704e8704a76d6973a0d5824a0bd3acd49dda3747669285d51303e36a69b1
font_01_sfnt_off0001010a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010A 10548 bytes
SHA-256: 8d7c0024fc272ac7fd4a616fae2013814ab09e23f7bcb0a8088c54bf0ae5625a

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