Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f44a1775269bc48…

MALICIOUS

PDF

78.2 KB Created: 2021-03-24 22:51:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: cc4caa274192ab5c03e2af44caa68b92 SHA-1: 3e0decded4e689e46fd2405b86219a82c0bb5532 SHA-256: 3f44a1775269bc485a002f3dfc89ac8b387f92a805f6d1681b9786e7e2080d6d
134 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The presence of 'utm_term=hasbro+battleship+apk+free' in one URL indicates a lure for software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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.
  • 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://soxebez.ru/123?utm_term=hasbro+battleship+apk+free PDF link annotation
    • http://jonebukusopovet.mygamesonline.org/how_to_disable_viper_alarm_system.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/utd_campus_map.pdfIn PDF document text
    • http://zabemaladameg.medianewsonline.com/how_to_factory_reset_iphone_11_without_password_or_computer.pdfIn PDF document text
    • http://rezokivi.medianewsonline.com/davawetenepumo.pdfIn PDF document text
    • http://potuxoposutu.medianewsonline.com/face_3d_free_download.pdfIn PDF document text
    • http://xejapuz.getenjoyment.net/cogs_caravels_and_galleons.pdfIn PDF document text
    • https://xonalofogikovor.weebly.com/uploads/1/3/4/3/134372302/rovasogezinidim_saruxum_lovafatekere_numutir.pdfIn PDF document text
    • https://tusidotug.weebly.com/uploads/1/3/4/4/134482214/7861471.pdfIn PDF document text
    • https://cdn.sqhk.co/simikitivo/jjcgeYo/4916307561.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380382/normal_600aa5915b151.pdfIn PDF document text
    • https://xinofebew.weebly.com/uploads/1/3/5/3/135305957/2471379.pdfIn PDF document text
    • http://wijutomotagam.mypressonline.com/sickle_cell_disease_review.pdfIn PDF document text
    • https://jesepivop.weebly.com/uploads/1/3/1/4/131483445/6506776.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379856/normal_600a502a93ba9.pdfIn PDF document text
    • https://cdn.sqhk.co/gunakawujo/AhfHI3P/98409476571.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401694/normal_6019f4b54c936.pdfIn PDF document text
    • http://jufanurozud.getenjoyment.net/kereju.pdfIn PDF document text
    • https://doruxajowivabog.weebly.com/uploads/1/3/4/8/134870444/riripeti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vesedakowata.onlinewebshop.net/cutting_tools_file.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/fuxosevi.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/kedobisevagopupekaru.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/xutosumatujom.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/definition_of_the_word_auditor_s_report.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/french_tip_guide_strips.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_off0000f224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF224 5152 bytes
SHA-256: 59e2498fd7a3a990535b98289349a4adad68e56b96dff4589f537adedaf2a53e
font_01_sfnt_off00010398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10398 11228 bytes
SHA-256: 6867537cc66d5142652bf1167373382548121193d6527d50124ff9c4a1a5faf5

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