Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bdf450108291ff0…

MALICIOUS

PDF

77.7 KB Created: 2021-04-03 21:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: eb6ac4395b9714864c31ab90bcb495ac SHA-1: 3e3b3d6af9681276c18ea0de29873c2ef534ab75 SHA-256: 8bdf450108291ff08c6b7cb978e4b8e97855f2746888e2b3dedf28abd682bafe
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains embedded URLs and is flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. The document body, though truncated, suggests a lure related to 'stages of meiosis worksheet answers', which is likely a pretext to encourage users to click the embedded link to 'dugedepap.ru'. This link farm behavior and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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=stages+of+meiosis+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490001/normal_60664da248498.pdfIn PDF document text
    • https://fofebufog.weebly.com/uploads/1/3/4/7/134738758/368e397686c0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472481/normal_6044d59e1724b.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzomorikat/MgiBgdt/fosisemonivewax.pdfIn PDF document text
    • https://cdn.sqhk.co/waxoxewanuvi/yhdihia/lucky_block_minecraft_server_list.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464863/normal_6006d7bd87a93.pdfIn PDF document text
    • https://kekuxepepave.weebly.com/uploads/1/3/0/7/130739312/levawazawu-didogusipunawa-kewurutivuxa.pdfIn PDF document text
    • https://butiziro.weebly.com/uploads/1/3/4/3/134308177/e4d489764ab1b8.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/iahfjd4/color_replacement_tool_photoshop_cc.pdfIn PDF document text
    • https://cdn.sqhk.co/zabitokepum/9ificji/yellow_aesthetic_wallpaper_iphone.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/pesetufavo/74978207704.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/the_taming_ofthe_shrew_shakespeare.pdfIn PDF document text
    • http://nolukufanalo.epizy.com/what_is_todays_julian_date_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b08add1d-8ad4-474e-9c17-fc0686f10b2f/what_year_did_the_great_depression_start_and_end.pdfIn PDF document text
    • http://sedilipabowarad.rf.gd/56772947800.pdfIn PDF document text
    • http://xijevireral.rf.gd/will_baldurs_gate_3_be_on_xbox_series_x.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc6290c2-2ac7-4659-9114-67f68c0b5236/start_my_toro_snowblower.pdfIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/candied_ginger_nutrition_information.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/browser_android_apk.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_off0000f2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C5 5408 bytes
SHA-256: 72cb996757f7270c7a5f4d5d6dd9fbe5d8ed0a4f26d0153ced035416619790ca
font_01_sfnt_off00010515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10515 10664 bytes
SHA-256: 5b04d77778c13037012b7f953ec33f802246626934e02e88c44afa2dfc9a6c71

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