Malicious PDF — malware analysis report

Static analysis result for SHA-256 84ecda0ebca6e7c7…

MALICIOUS

PDF

90.9 KB Created: 2021-03-01 11:51:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: dc34ae58028096590d8b2e26322c1135 SHA-1: d755d1569b51985c2909c485e77d4593da03dbec SHA-256: 84ecda0ebca6e7c74528526581709873d9fee106ca9b40b60945540e69142485
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary malicious URL identified is https://ponafet.ru/strik?utm_term=free+online+digital+photography+courses+uk, which is likely used to deliver a secondary payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/strik?utm_term=free+online+digital+photography+courses+uk PDF link annotation
    • http://wavoxibex.iblogger.org/pelidowibasujarevaropujo.pdfIn PDF document text
    • https://cdn.sqhk.co/pufuxarabo/hcwLnHj/real_bike_racing_mod_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/mudebijutene/jaiiwIV/30960123329.pdfIn PDF document text
    • https://cdn.sqhk.co/vobevufubito/7Odjiij/83399015180.pdfIn PDF document text
    • https://cdn.sqhk.co/luxixumogez/ggjdvid/dual_monitor_desk_mount_white.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/nigimul/rugadabewude.pdfIn PDF document text
    • http://luwatejanif.epizy.com/painting_with_a_twist_ideas.pdfIn PDF document text
    • http://pokatutabojew.rf.gd/bekutaleraf.pdfIn PDF document text
    • http://dotaxamis.epizy.com/how_much_does_a_small_refrigerator_cost.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/aging_analysis_report_template.pdfIn PDF document text
    • http://tokiziguvavu.rf.gd/fashion_bd_video_song.pdfIn PDF document text
    • http://xasaduditomup.epizy.com/kuvetatekejoxejaku.pdfIn PDF document text
    • http://kipafiperugava.epizy.com/allstate_benefits_wellness_claim_form.pdfIn PDF document text
    • http://safifalemu.rf.gd/23963378925.pdfIn PDF document text
    • http://gowefemum.epizy.com/is_the_fitbit_charge_2_waterproof_for_swimming.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/88221683946.pdfIn PDF document text
    • http://dumudolaba.epizy.com/ahri_cpd_guidelines.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE4 6812 bytes
SHA-256: 2e0ee37cd64f4c35472631c058407906ad20f0781d2500579fe3f45af03c2431
font_01_sfnt_off00010e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1B 5456 bytes
SHA-256: 558962bb2f919853ac50ae857fe2e59e70bcc2ea1e66238bab623ef0ff4123f2
font_02_sfnt_off000120ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AE 11180 bytes
SHA-256: 082d837aa6f9ba704f2bbe76c99a283bc6109b3d5ac71341429fd8ca4a193fc9
font_03_sfnt_off0001469d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1469D 16616 bytes
SHA-256: 7ab81ce3d92a9ec80982bbbf7df4378fdf9290867a146be245f32411f9d17586

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