Malicious PDF — malware analysis report

Static analysis result for SHA-256 308b22ed6f8f8570…

MALICIOUS

PDF

81.1 KB Created: 2021-03-24 20:15:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c6e50edc3d0644ac41f2b46fb48ba6f4 SHA-1: c78f0c748d0ec05015d4338aa0c04df2d9eb789b SHA-256: 308b22ed6f8f8570862ecaed5d745af85dd995b87158199592f4fbc742f5eac1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

Heuristics 6

  • 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.
  • 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://ponafet.ru/wix?keyword=carver+county+property+tax+statement+2019 PDF link annotation
    • https://cdn.sqhk.co/nogawevorus/iDihgew/pirates_of_the_caribbean_tow_game_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/nukusigemug/iMjdG90/garojaj.pdfIn PDF document text
    • http://igclienteam.com/57867479601ocibc.pdfIn PDF document text
    • https://cdn.sqhk.co/muluxodipoto/2Zkgiic/usa_all_star_soccer_team.pdfIn PDF document text
    • https://cdn.sqhk.co/vuritukupus/ihwajbC/pujerazopubuma.pdfIn PDF document text
    • http://stylecurtains.com/anatomia_aparato_locomotor6w381.pdfIn PDF document text
    • https://cdn.sqhk.co/vedoreket/jaggigv/19459576929.pdfIn PDF document text
    • https://cdn.sqhk.co/zapiseniw/hixghjg/22035865632.pdfIn PDF document text
    • https://cdn.sqhk.co/tefupudoma/7Jqjjof/skins_for_minecraft_pe_and_pc_9_2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388279/normal_600a84a954562.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414175/normal_6054ba0a2a459.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448995/normal_5fe4ec95ba145.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ae8c1479-5121-4009-b0ed-8259dbb1205b.filesusr.com/ugd/0aff45_21fffc0ff6154e36a26638209f06a468.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b22b8d0e-6476-4a36-b8c6-29beb11fbd86/samsung_un55ju6700fxza_stand.pdfIn PDF document text
    • https://c140f178-ee45-427e-91fe-a3c5f821f67e.filesusr.com/ugd/ebc5f9_0ed6137b117d4e879ecfffdce36076c7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ca52c06-de0b-4b37-8c44-0f65aeb506b5/fafurozufixiduxokixowul.pdfIn PDF document text
    • https://34e51215-b586-4e01-b3ea-a219475a7b91.filesusr.com/ugd/46481b_ba55bf182fbe4ff29683c030817b1aab.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/86f10fc0-facd-471f-ab45-2a4ce2f8ebd3/36797141752.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3258966-4eba-4de4-b37d-0771b8565acc/pafubususurij.pdfIn PDF document text
    • https://05491ccc-77c7-428b-9c25-74f2c6c50d4a.filesusr.com/ugd/d51d36_c55792eddd464b588ca47633b1ba94bd.pdf?index=trueIn PDF document text
    • https://cb47f074-0476-4434-b381-5672a365cab8.filesusr.com/ugd/c46c8a_be9c254a971c45d396c47d90e2e278eb.pdf?index=trueIn 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_off0000fe57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE57 5664 bytes
SHA-256: ef219c29854839f0ca04e34c0d5ffabe824de106b8573c240fe80a75a963663d
font_01_sfnt_off00011192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11192 10996 bytes
SHA-256: 350b1d1ef1cb0e16ed644b59d29629eb8f55e57871bed369cdd7e063dd840618

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