Malicious PDF — malware analysis report

Static analysis result for SHA-256 819c0d175eefc20b…

MALICIOUS

PDF

79.8 KB Created: 2021-06-10 14:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cee363bae7cc1f9a57edd24b700429fb SHA-1: 751e99e5c382f9b5449200fa9d8670c85c4c8678 SHA-256: 819c0d175eefc20b4f349e16c8a1fbc73e807070cf3724b26249876ca8ba3bb6
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 0.9996

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://coretry.ru/pbw?utm_term=infant+percentile+growth+chart PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383930/normal_605ef88558979.pdfIn PDF document text
    • https://dogamoduxex.weebly.com/uploads/1/3/4/4/134481485/vexazosezelusutox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501037/normal_60407df8ee3e5.pdfIn PDF document text
    • https://riligasiguvenu.weebly.com/uploads/1/3/5/3/135392009/ruwavutusadiwen-zotufawe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450434/normal_5fcf83d2011d5.pdfIn PDF document text
    • https://xapowupitub.weebly.com/uploads/1/3/7/5/137513350/7ecb6bed4eeb6b6.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://uploads.strikinglycdn.com/files/6232cdbe-7759-4a44-b162-4a9e7c8e66cf/xigodovomewofimosegalime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d297e71-51a1-41bd-b662-6767f7cf3651/white_tiger_book_vs_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2eb4649-4639-4a34-91fb-bc9ca1faf216/un_puente_hacia_terabithia_descargar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3a902d6-1a2e-41b2-8950-fcad549d95b3/the_secret_book_listen_online.pdfIn PDF document text
    • http://finebov.pbworks.com/f/32296883905.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c306ca86-b1d6-49e2-b1c1-db52b54fd2b3/77754726386.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2aaa281-6c14-4850-9697-7a966e155a8a/79182600221.pdfIn PDF document text
    • http://zabodovojif.pbworks.com/f/51968214913.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/603be437-36a7-41d7-9ef2-e3d5b37cff2f/bafebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bac0ecb6-cca9-4fe6-8489-f8f5214421ad/why_does_my_dyson_dc44_keep_stopping.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c520b3f2-62c9-4217-9bae-4fb20ffdd2e5/ruteme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c78a1d0a-01c2-422a-976f-c3cf078ddce0/skywalker_15_rectangle_trampoline_cover.pdfIn PDF document text
    • http://gopamux.pbworks.com/w/file/fetch/144895869/xaropo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66d362df-e7b6-4079-99ed-7d8e96afb798/power_pressure_cooker_xl_beef_stew_recipes.pdfIn PDF document text
    • http://lopofemusun.pbworks.com/f/nimutukoboropezer.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_off0000ef35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF35 4916 bytes
SHA-256: 9ccfd97de0cb8f3a8d74b123b1762e08b433d48a21ab31c73940b2524afad008
font_01_sfnt_off0000ffed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFED 10600 bytes
SHA-256: 0c822440c495200ad6662306acbf96c34eb5e0223684d950c30c496f7d97b564
font_02_sfnt_off000123e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E8 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3