Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff0dbb91e5d0b055…

MALICIOUS

PDF

116.0 KB Created: 2021-03-06 10:33:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 78560a04451841448d3fd0063f6c7a47 SHA-1: f07b4374e4df1ccb1b477a227e275df9d1866d99 SHA-256: ff0dbb91e5d0b0554e7ab19ec0790ad2f47fb71112ba39fca0ead9722e5498a5
164 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, with one prominent link pointing to a suspicious domain ('kuzutuzo.ru') that is likely part of a link farm or phishing campaign. The presence of a 'Download' button lure further supports a deceptive user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kuzutuzo.ru/wix?keyword=apk+tv+player+br PDF link annotation
    • https://cdn.sqhk.co/zenokosix/aqjjh92/roadside_turnout_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/hdifshb/kajojobazepubijo.pdfIn PDF document text
    • https://cdn.sqhk.co/fapolokid/ijbxihj/65194412262.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371023/normal_60091e3932784.pdfIn PDF document text
    • http://bifugejif.22web.org/latest_cv_format_template_2018.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476954/normal_5ffcc6e332412.pdfIn PDF document text
    • http://vumavotanumibuv.iblogger.org/arun_sharma_data_interpretation_book.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468296/normal_5fde421b997ba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a0a5ada1-270c-452f-b092-d943fc6f0dc0.filesusr.com/ugd/306762_e5bfeb8c6f884044b37d433b74b4bd6f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/brother_hl-2240_printing_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/bhakti_movement_in_assam.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/jeep_grand_cherokee_pcm_reset.pdfIn PDF document text
    • http://wopawotejexu.epizy.com/48211066071.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/doxokigajedopalakal.pdfIn PDF document text
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_c72c963eab1c4662accfec41ba5786ca.pdf?index=trueIn PDF document text
    • http://sopikakerozobud.epizy.com/42009769037.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/adobe_illustrator_hair_brushes_free.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/geresikesed.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_off0001754a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1754A 6176 bytes
SHA-256: 64dd7d3ec35fb511e1e9a15e5d4cd7d9c18fb35e252298c1a6ba8b9574460773
font_01_sfnt_off000189fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189FC 4992 bytes
SHA-256: 85070b3fb125959b513c88f1c7d4742c06b29ee3965b04e14fbe0e68504453c8
font_02_sfnt_off00019b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B12 11500 bytes
SHA-256: e94b7123ba716079378c680462850425fa011b55944099233531e54e95c619d6

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