Malicious PDF — malware analysis report

Static analysis result for SHA-256 c932536e6bb8cd13…

MALICIOUS

PDF

72.3 KB Created: 2021-03-24 02:42:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b7b127af7f50a074522278af34d90147 SHA-1: 938d9c7830f02065356fea1b601b8873f94a4d95 SHA-256: c932536e6bb8cd13a003ed201fc15d4844f327385951e0a9b86607a907ed780f
186 Risk Score

Malware Insights

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

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 0.9995

Heuristics 6

  • 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 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.
  • 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://midufefew.ru/wix?keyword=majora%2527s+mask+n64+strategy+guide PDF link annotation
    • http://xafesuvorolivig.scienceontheweb.net/angle_worksheets.pdfIn PDF document text
    • http://sutarakikim.scienceontheweb.net/2478727816.pdfIn PDF document text
    • https://lifadupelede.weebly.com/uploads/1/3/5/4/135401245/9d41b0.pdfIn PDF document text
    • https://puxodemidumez.weebly.com/uploads/1/3/5/3/135345879/lipodiran.pdfIn PDF document text
    • https://cdn.sqhk.co/wukiratuxazo/jrWIMtv/magobobuwugedoligusoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498883/normal_6008dc632cc83.pdfIn PDF document text
    • https://namutaborizelo.weebly.com/uploads/1/3/4/7/134766338/6928584.pdfIn PDF document text
    • https://cdn.sqhk.co/devuzemalut/NQUAhcO/vertical_jump_over_hurdles.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426823/normal_6059c309764b5.pdfIn PDF document text
    • https://cdn.sqhk.co/rizijuwet/gdMidug/54300389014.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481418/normal_60493dff1810a.pdfIn PDF document text
    • https://xopezafetuwov.weebly.com/uploads/1/3/5/3/135314897/renavotizimija_puxujijasa.pdfIn PDF document text
    • https://cdn.sqhk.co/gegatuzikat/UWdghiK/alienware_keyboard_aw768_warranty.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5cda22d-4c99-4605-8220-22f8cae30803/data_warehouse_concepts_design_and_data_integration_week_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dffd5647-fb84-4539-badb-1f4221ec1e98/81050202746.pdfIn PDF document text
    • http://lugenizuridaj.atwebpages.com/natuza.pdfIn PDF document text
    • http://doritiwenoxa.onlinewebshop.net/calligraphy_for_beginners_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53e8bbab-e95f-436e-945c-8f1ae3b6d17b/xepafaxibidipetokig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80e6a7a4-b3a5-4ff2-b410-530051f8a32b/kepavegitotopiresazomij.pdfIn PDF document text
    • http://suzebotazolonav.epizy.com/jufezabikotuxu.pdfIn PDF document text
    • http://dojiseb.epizy.com/61449818902.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c998b02-ecb6-47c0-b101-8a39a2fa7cf7/flysky_gt3b_voltage_regulator_mod.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_off0000d759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD759 5636 bytes
SHA-256: 2416e9ed60f9f5f081e71510c642e6407aad902c3006ee0135b2cf91eeae6939
font_01_sfnt_off0000ea9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9F 12748 bytes
SHA-256: 9da4e4630c318467db4cd2471054ba32b888c20b66b087777572694e54514c76