Malicious PDF — malware analysis report

Static analysis result for SHA-256 745f1388fb57fc6a…

MALICIOUS

PDF

76.4 KB Created: 2021-03-13 23:49:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d8a9e99c398103d0260e0353f739b500 SHA-1: d41f50f3576d2309e1f80d92521308895239b5a0 SHA-256: 745f1388fb57fc6a41690991a6752c882ae10dd9c2c84ab70906dc9a95bbe5b0
126 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains keywords related to a grammar workbook, indicating a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/award?keyword=understanding+and+using+english+grammar+workbook+5th+edition+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379987/normal_6039d95261b77.pdfIn PDF document text
    • http://e-devletturkiyeaidatsistemimgovtr.com/cash_money_app_download180rr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407795/normal_6034ec297be47.pdfIn PDF document text
    • http://esclick.pro/729077919090r4o6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454167/normal_5fda6830cdc98.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377095/normal_5fe4764b925cd.pdfIn PDF document text
    • http://mujudesuxiropa.sportsontheweb.net/lilebevobara.pdfIn PDF document text
    • http://onsideball.info/besajowezebije8ks51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481166/normal_602928e8c9f48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489052/normal_603c3c0541e26.pdfIn PDF document text
    • http://xuxijosut.sportsontheweb.net/sivikudo.pdfIn PDF document text
    • http://zzzmmmmejjj.space/tetuzidolokegufagekuxaa4iz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378599/normal_5fcb485395319.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385198/normal_60176b1ef0e97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392872/normal_601731f93fdd0.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/jenagubadopi/51456568238.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/jsw_deck_sheet_catalogue.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/stock_investing_for_dummies_5th_edition_download.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/battlefield_3_pc_free_full.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/dijafexisiwiduzixunugonex.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CE 5868 bytes
SHA-256: fec4d434caa1e35c0768a2daf4c006c71c9222951d50a29a3809f012d6cd97c8
font_01_sfnt_off0000e7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AD 11356 bytes
SHA-256: 7e2691789061fd81646e8b08619dad445c1db4be8585a0d1cff736cf2dcf0bc5
font_02_sfnt_off00010eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBA 16084 bytes
SHA-256: 462d13bd97d7d9b38b38dac4ddb889f891d4742debcdf3bbf084b15d68e01d41

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