Malicious PDF — malware analysis report

Static analysis result for SHA-256 8555ccfc00387f66…

MALICIOUS

PDF

81.7 KB Created: 2021-05-26 18:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 85d83190f5903baa948c914fbaf0de84 SHA-1: cf5ef82e530c025b2aa6abecdd7252d61d18740b SHA-256: 8555ccfc00387f6697b948660314f84a3ab728ccd5c426a3937532d34ccdc296
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 0.9998

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://lozipotod.ru/strik?utm_term=how+to+convert+fructosamine+to+a1c PDF link annotation
    • https://mokaredoraxo.weebly.com/uploads/1/3/4/0/134095924/28edaa540.pdfIn PDF document text
    • https://jutewalezozapon.weebly.com/uploads/1/3/4/0/134016751/mowikesi.pdfIn PDF document text
    • https://xizotikozuza.weebly.com/uploads/1/3/4/5/134587863/5160091.pdfIn PDF document text
    • https://wiwoxedanin.weebly.com/uploads/1/3/4/0/134012493/butadusosotoru_lulopoxaf_xatogosegese.pdfIn PDF document text
    • https://wuwixebesa.weebly.com/uploads/1/3/4/5/134506807/bupiw.pdfIn PDF document text
    • https://kobenavu.weebly.com/uploads/1/3/4/7/134714827/fee250.pdfIn PDF document text
    • https://gapulujazupimes.weebly.com/uploads/1/3/4/7/134775062/8396254.pdfIn PDF document text
    • https://kaxijegomodonot.weebly.com/uploads/1/3/4/4/134496279/wanopudulomun.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/6b852cf6-0304-4256-a8c0-5ccbc46433c9/88740151498.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/211843f0-3c20-4904-a1ca-4346e24124fe/41353515749.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8e58e9b-6fbf-4f0a-86ce-c087e4085ace/data_warehouse_architectures_types.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd0b54fa-8050-4a87-8d51-0864350d0c06/pilefulosodu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9e143f1-4108-4ffa-a14a-761e321584b5/95916592888.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/213532e8-e2ee-4be1-8af1-99a55df3dab1/pengajaran_surah_al_mulk_ayat_1-15.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/194ad6e0-a4e1-4b35-9695-3308cf0ab2aa/simplicity_regent_44_inch_mower_deck_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42a81916-9936-44ef-afc8-8a4219d8f6d8/37375491091.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_off0000ebbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBE 5160 bytes
SHA-256: f64e026950db9b82ff681a9b8f5cca41270e5961176fe3e672deec050fd3beb8
font_01_sfnt_off0000fd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD54 11280 bytes
SHA-256: 49315f879c335220c3f46b325ec5fa5529d1e4ab99cc9dd51a3d8d60c770053d
font_02_sfnt_off00012411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12411 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd