Malicious PDF — malware analysis report

Static analysis result for SHA-256 698713f2fb5629cc…

MALICIOUS

PDF

78.3 KB Created: 2021-05-10 05:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a3023ebc55252d27df72dc4be9022e84 SHA-1: 1059c03ad36a1d5f4a44e9627d8e18b9f1fd19d8 SHA-256: 698713f2fb5629cc156734a0bd62792808c0290a382979b35d43a6515fb73ae0
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://crophysi.ru/strik?utm_term=how+to+write+a+summary+for+4th+grade PDF link annotation
    • http://jedusajinud.mygamesonline.org/63499948524.pdfIn PDF document text
    • https://repugonajipivup.weebly.com/uploads/1/3/0/8/130814926/4280655.pdfIn PDF document text
    • https://nelizebowi.weebly.com/uploads/1/3/4/7/134734992/39d2b.pdfIn PDF document text
    • http://viwavidif.getenjoyment.net/wotajoganujejujez.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/8438c9e0-0076-486b-bc24-987b366760f5/wozukepavexo.pdfIn PDF document text
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_de49244f009e436ba9e94675c536a655.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b09fded-baa4-4629-a251-861f678c376f/best_temperature_firefly_2.pdfIn PDF document text
    • https://167c8e7b-8160-49a2-a88e-f26749d647c8.filesusr.com/ugd/1ad47d_6f1ead4feeee493e853f5d000a5243c3.pdf?index=trueIn PDF document text
    • https://9fbeb193-358d-48fe-b9d9-45f8b63f6b3c.filesusr.com/ugd/ab67b9_959853bb39954cccbecb2442847ca76e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6696a02-4038-4c2a-8171-5d190f65f9ae/lubelukusuvimob.pdfIn PDF document text
    • https://06e27459-8a58-4d01-a48e-f853eab966f6.filesusr.com/ugd/55f1a0_d00794bb1eae492694d71982b3c912d6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a10c9e6-9023-4ced-9c63-ea67efd148f6/dodagebogidimozuje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99e8d351-8a54-499e-bb87-d3bf91264201/words_to_song_the_rising_sun.pdfIn PDF document text
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_7933cf46f7834893be946f17b2631f6a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/84143e07-efc8-4b0f-8e72-1ecd4ee04756/zufidutebekugugepobefim.pdfIn PDF document text
    • https://75e6d08a-b14f-4c2c-bd4e-3e6431d9d11c.filesusr.com/ugd/497a87_cece915847914468ae6305844314c45e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b61e590-3bea-49a7-bc7d-ad83659bbfc4/fezajewejipamado.pdfIn PDF document text
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_dd61ca1b18df4b21a11b1072a82d412e.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_off0000f3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C1 5532 bytes
SHA-256: eb0120bc4d30b99baadbd011e3068fdd8511149e2dee435f3c38811855a232d9
font_01_sfnt_off00010682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10682 11084 bytes
SHA-256: 52fd37b1921ca8581a4d93d868041990772e8e240b886de610dc4a2f740d44bc