Malicious PDF — malware analysis report

Static analysis result for SHA-256 e62c3838006d1ebf…

MALICIOUS

PDF

73.1 KB Created: 2021-02-13 16:24:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b9e6778222483caa0aabf2fe340d48f3 SHA-1: 2e98ee4e4ea2176f0375648ed12486675a491c06 SHA-256: e62c3838006d1ebf501df79b1ca23d8e2715e34908334a38b3d62a7aefbf80ef
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are to benign-looking PDF files, suggesting a link farm or SEO poisoning tactic. One prominent URL, https://bologen.ru/wb?keyword=seasonal%20affective%20disorder%20treatment%20pdf, is presented as a search result, likely to trick users into clicking it. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bologen.ru/wb?keyword=seasonal%20affective%20disorder%20treatment%20pdf PDF link annotation
    • https://kesiwupi.weebly.com/uploads/1/3/1/4/131407351/guruvurobon-tofutefanage-tesorobumijoju.pdfIn PDF document text
    • https://kofezewi.weebly.com/uploads/1/3/2/3/132302944/3be7b.pdfIn PDF document text
    • http://xobokalute.iblogger.org/reririjodo.pdfIn PDF document text
    • https://gizutiki.weebly.com/uploads/1/3/4/4/134478998/gunevijek.pdfIn PDF document text
    • https://deremufirig.weebly.com/uploads/1/3/4/8/134854029/7788991.pdfIn PDF document text
    • https://vumerajijo.weebly.com/uploads/1/3/2/8/132815742/7001261.pdfIn PDF document text
    • http://tevuvisena.iblogger.org/bsde_annual_report_2014.pdfIn PDF document text
    • http://natezaka.iblogger.org/zizaxoxufebejisunoputi.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
    • https://s3.amazonaws.com/tokudapele/arabic_chillout_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/free_drawing_practice_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/gnu_assembler_tutorial.pdfIn PDF document text
    • http://gobavaduxa.epizy.com/how_long_to_cook_sheet_pan_salmon.pdfIn PDF document text
    • http://besasasef.rf.gd/free_you_ve_been_booed_template.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/43120644840.pdfIn PDF document text
    • http://patenat.epizy.com/bengali_short_comedy_drama.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/sawanawasuxedinupibo.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/ronco_e_apneia_do_sono.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/6602062857.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/36960573277.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/turn_answer_machine_off_iphone_6.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A4 5252 bytes
SHA-256: febde7433fdf8b8d506957d3b6d98e644724497cb77ed032d1b422f8cdcb4177
font_01_sfnt_off0000e663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE663 10104 bytes
SHA-256: 250e97d92603b6451192f9287e6fb66e71e9fd00de91e8b0e898a965cbb06323
font_02_sfnt_off00010904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10904 4324 bytes
SHA-256: ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c

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