Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f625685ae5c06ba…

MALICIOUS

PDF

88.2 KB Created: 2021-02-23 04:57:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: c77066f6e3b396de1dda46eda3bd4dfb SHA-1: 0cc8885e91790d0515364e314bd9a026133bcaac SHA-256: 9f625685ae5c06ba81e7b69990cf8b6e22e93f6be92943d1a66791e77768b0e6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The document body, though heavily obfuscated, suggests a lure related to a 'case study answer key', which is a common pretext for phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=the+perez+family+story+case+study+answer+key PDF link annotation
    • http://strahuemsya.info/jovusidihpxdd.pdfIn PDF document text
    • https://mokugutareno.weebly.com/uploads/1/3/1/6/131606089/nekudujorona-luguvifibagexu-sazufanenaliwap.pdfIn PDF document text
    • http://snail-case.store/crown_xti_4002_for_salexu537.pdfIn PDF document text
    • http://natlegend.space/918577701992qwz8.pdfIn PDF document text
    • http://dipufuvolog.iblogger.org/merowojososejadixumab.pdfIn PDF document text
    • http://vseti.life/tebibumovupotm0qyg.pdfIn PDF document text
    • http://capridigi.com/audio-technica_at-lp120xusb_manual_direct-drive_turntable_bluetooth66ezd.pdfIn PDF document text
    • https://bolowarokarov.weebly.com/uploads/1/3/4/3/134349384/xuwezetibapovagefaro.pdfIn PDF document text
    • http://uspehdnyaaxyz.xyz/61086643450ypgq6.pdfIn PDF document text
    • http://vinoxulib.iblogger.org/nixekimitanat.pdfIn PDF document text
    • https://badobokitevobux.weebly.com/uploads/1/3/0/9/130969603/wuwitosekiteke.pdfIn PDF document text
    • http://hookup153.online/bometoguammk0.pdfIn PDF document text
    • https://polerobozugewif.weebly.com/uploads/1/3/4/3/134344868/4292254.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gejevebo.epizy.com/analyzing_data_biology_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/95006317427.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/justin_bieber_video_songs_mp4.pdfIn PDF document text
    • http://bewomad.rf.gd/best_navy_seal_movie_on_netflix.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/44214320002.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/government_housing_allowance_application_form.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_off00011a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A69 5652 bytes
SHA-256: afe256b14ab38232615ce20332f45095f18931939f115a212a0e9aa54e7fe5b8
font_01_sfnt_off00012d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D92 11080 bytes
SHA-256: 5eea65f1cc71489df4aebfd308031f3720c54e0dc903b09da497b8667e8e1f4b

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