Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b712b2fa96ae129…

MALICIOUS

PDF

77.1 KB Created: 2021-03-27 17:46:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7e76dce5187d00de25c08f77d10c4689 SHA-1: 0df8f9b6e58488808584859da8a35f216efc52f8 SHA-256: 2b712b2fa96ae129cb8775e2405ab14e4fd20423986f2bf68d7b744a9828a81e
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to S3 buckets and other domains, suggesting a link farm or redirection mechanism for phishing or malware distribution. The presence of an external URI pointing to 'baarspo.ru' with a 'utm_term' parameter further supports a lure-based attack, likely for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://baarspo.ru/123?utm_term=spreadsheets+google+find+duplicates PDF link annotation
    • http://zujonatuvetivux.iblogger.org/what_makes_the_plates_move_brainly.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470402/normal_604a9800de0ed.pdfIn PDF document text
    • http://nuraramibifowom.22web.org/ligageboluviwobuwizujo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447487/normal_600b94d519d97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452376/normal_6010f6515e751.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zuponefi/86293109588.pdfIn PDF document text
    • http://fozijijaraj.rf.gd/41840940556.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/behringer_x32_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/ownership_matters_report.pdfIn PDF document text
    • http://lixizuwigum.rf.gd/onaroo_teach_me_time_clock_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/88795560206.pdfIn PDF document text
    • http://sumidemeg.epizy.com/performance_macbook_air_2019.pdfIn PDF document text
    • http://suzujikuluvujov.rf.gd/amazing_grace_guitar_chords_g_c_d.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/cursive_handwriting_guide.pdfIn PDF document text
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_616604a29d964fe88fa08a2287aee67c.pdf?index=trueIn PDF document text
    • http://zaxenedapepobu.rf.gd/bumugosutuvopujobam.pdfIn PDF document text
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_dc2e232b93294fabb982b02046156ad2.pdf?index=trueIn PDF document text
    • https://b7f5b04e-b247-49a4-9dc0-39f0c843ec09.filesusr.com/ugd/b56f86_c9c287877da44fb988f543d4b6a47360.pdf?index=trueIn PDF document text
    • http://wozasunode.rf.gd/matlab_wavelet_toolbox_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/90304154555.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/free_writing_process_worksheet.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_off0000ec99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC99 5520 bytes
SHA-256: 66f580127b021b8335aa99e4198bc2bfa709eb55745c5f11b68e563f9768435d
font_01_sfnt_off0000ff59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF59 11708 bytes
SHA-256: 9a7dd9350f317bd80217170ef703265e4dcaff3d66c9db3a02f0dc3b579ec930

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