Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef07709253bbc504…

MALICIOUS

PDF

79.3 KB Created: 2021-03-29 02:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 683a268aee0c5d9b5ddd99e31d5e04b4 SHA-1: 7f4034c98721086e1bd8a7d505b822ff8f564a40 SHA-256: ef07709253bbc50485c16f744e2c08c6b20778ccf48f61bf03ebd30ae1da1d10
194 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a significant number of external links, indicating a link farm strategy, likely for SEO manipulation or to redirect users to malicious sites. The primary URL observed is https://mezovuduw.ru/wix?keyword=converse+return+policy+if+worn, which is part of a broader pattern of disposable hosting and link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://mezovuduw.ru/wix?keyword=converse+return+policy+if+worn PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452398/normal_6029ae725c7c3.pdfIn PDF document text
    • https://cdn.sqhk.co/jojikoxazew/fjaMjTu/car_parking_multiplayer_online_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/2hbhe5u/95174820490.pdfIn PDF document text
    • http://remont-pc.website/decimal_tenths_number_line_worksheetswi0gk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420906/normal_605ffa6b57582.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/ihbhhhe/vobifigu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403540/normal_60207b4bbc049.pdfIn PDF document text
    • http://sysfix.ru/he_will_get_well_soon_meaning_in_urdur3yly.pdfIn PDF document text
    • https://cdn.sqhk.co/nodujugebi/ZB6ghjd/axis_360_kindle.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzekofuwe/ibicUg5/76175869306.pdfIn PDF document text
    • http://webmastervlad.ru/lozazekixemoxulebezias3ea.pdfIn PDF document text
    • http://frontglass.xyz/ayyappa_telugu_songs_by_yesudas56c95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407807/normal_601e68b1c37f5.pdfIn PDF document text
    • http://begemot.space/can_you_download_sketchup_freert157.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484122/normal_605efa7679e72.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/hePnoC8/rubijezupabezibe.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
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_6310b3b82466484d972924a3860858f5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/82751543133.pdfIn PDF document text
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_674f10445c474aff94e347a6f32ba8ff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/softonic_android_data_recovery.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/44393566757.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/gubipu.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_off0000e8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EA 4960 bytes
SHA-256: e74ca82166b2960665d99fe281c7e378921e28c1240833708052e26a2a5fdafc
font_01_sfnt_off0000f9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F8 11212 bytes
SHA-256: f62415347b14dbb78c2abaa16c62358c01b33b38d3cb11a009fcf8ca2061f58a
font_02_sfnt_off0001206e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206E 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2