Malicious PDF — malware analysis report

Static analysis result for SHA-256 b248d034bf900287…

MALICIOUS

PDF

79.3 KB Created: 2021-03-22 04:45:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 31a8f87760353c9e0552938d9170adb3 SHA-1: 9552fbc16d56fcb961267fcfc0c89dfa93e2022f SHA-256: b248d034bf900287e2e8a222f56f944709c4bafb69a33f3bb438d12c20913fb2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://baarspo.ru/wix?keyword=manual+definicion+juridica PDF link annotation
    • https://cdn.sqhk.co/veladaxuzeba/dD1fTMS/rave_videos_with_friends_desktop.pdfIn PDF document text
    • http://gofimowekes.66ghz.com/complex_ion_nomenclature_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/bokirebi/ghlnLxT/24465689198.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472204/normal_5fde79d5099d7.pdfIn PDF document text
    • https://cdn.sqhk.co/nufesewepi/bijDHmL/xtreme_drift_2_hacked.pdfIn PDF document text
    • http://wodedutipif.medianewsonline.com/risk_assessment_in_social_work.pdfIn PDF document text
    • https://cdn.sqhk.co/movijomo/4jdii3N/monster_energy_supercross_game_pc_requirements.pdfIn PDF document text
    • https://cdn.sqhk.co/nufesewepi/2hbxvig/fopesosobanuvusumem.pdfIn PDF document text
    • http://xepuxesadara.mypressonline.com/tipos_de_sistemas_de_informacin_en_una_empresa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370265/normal_60349a7e8a840.pdfIn PDF document text
    • http://numufubigefak.iblogger.org/29306457825.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469847/normal_601b183721901.pdfIn PDF document text
    • http://lazotub.mywebcommunity.org/burda_shareef.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
    • http://putojoner.rf.gd/vufodigifajasidule.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/days_of_the_week_calendar.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/free_bomber_jacket_template_psd.pdfIn PDF document text
    • http://weverikovufom.rf.gd/biological_diversity_convention.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/67767908562.pdfIn PDF document text
    • http://fadifisevak.epizy.com/cdc_travel_guide_japan.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_off0000ead7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD7 4720 bytes
SHA-256: d0a7ef6cb48cff3a3eb353eb97b3e93ab07ffe21d502f7717e036e625f154cf6
font_01_sfnt_off0000fae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE3 12136 bytes
SHA-256: 2176ce55a482457f211d2424ff52655dcc88ae642453f01bad2cfe3e51d6e3bf
font_02_sfnt_off000121cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CF 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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