Malicious PDF — malware analysis report

Static analysis result for SHA-256 af7da5b7151531c7…

MALICIOUS

PDF

94.6 KB Created: 2021-04-20 04:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b3e2adee71ec243b7db3a3a553dedf50 SHA-1: 520d97a2f2dffc5608f811c92011cdec16a4c52c SHA-256: af7da5b7151531c79cf4be319317babfa3f9dd5ed6e9c6b2d95c7bc538eb3338
226 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. It uses a password-protected-archive lure. 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 0.9990

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://xezojetit.ru/strik?utm_term=digi+002+driver+mac+high+sierra PDF link annotation
    • https://cdn.sqhk.co/wodigajamu/icghoFz/66791662099.pdfIn PDF document text
    • https://cdn.sqhk.co/surixirulol/jfhfOhh/emergency_contact_list_template_for_construction_site.pdfIn PDF document text
    • https://cdn.sqhk.co/liramesot/gihggjj/pefubukoneni.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/LmhhDgc/63232815657.pdfIn PDF document text
    • https://cdn.sqhk.co/noxivudeva/dgjNBjc/gmx_cloud_download.pdfIn PDF document text
    • http://pokinusuvato.getenjoyment.net/etiology_of_rheumatoid_arthritis.pdfIn PDF document text
    • http://pasikufopubiwo.mypressonline.com/gukefol.pdfIn PDF document text
    • http://winatesef.sportsontheweb.net/nomudiwugedosonudar.pdfIn PDF document text
    • http://lilozekakotelup.sportsontheweb.net/tovepetet.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/nCjVhjs/ritixapagufuxinukezewilad.pdfIn PDF document text
    • https://cdn.sqhk.co/gederanew/ih8bYze/dedorijawomazijovivaxuja.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://s3.amazonaws.com/gezizefefififa/guided_reading_kindergarten_lesson_plan_template.pdfIn PDF document text
    • https://691dfa98-c543-4342-b77d-a3d7fbf094aa.filesusr.com/ugd/d55835_7c4ecfa901684feaabddd467425f44b5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/algebra_2_regents_answers_august_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7456d46b-4a31-4d04-b6bb-f9556ce31203/rezabubasodakumifajubopel.pdfIn PDF document text
    • http://gemovimuwopete.atwebpages.com/metal_gear_solid_5_quiet_model.pdfIn PDF document text
    • https://33da92c3-26de-4f6b-bf12-1693cb6a6e79.filesusr.com/ugd/0307f2_014f068fbe894363ad5f62315b5baf91.pdf?index=trueIn PDF document text
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_3464b6558ca940ef8c1fb4bff2a534db.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/26de57b0-b067-4aaf-a3a3-5b8e0efb64ac/neato_botvac_d6_connected_robot_vacuum.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/can_i_do_python_programming_on_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fcd319b-e0a7-4fc6-9902-01eb6a3c71c9/kimogevipobigovulo.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/microsoft_excel_inventory_template_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ef5e45f-9e95-484a-a5b1-0e111c619702/gowudifapusujan.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_off0001214c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214C 5148 bytes
SHA-256: fe0d475e56fb7ee5669cbe953ed765ae1816a32fda5718303b4734211958a9e1
font_01_sfnt_off000132ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CA 12528 bytes
SHA-256: e0902e0d4747e51342a130066297bb255f4e7109e8347fb57f42df1884e7c75d
font_02_sfnt_off00015cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CF6 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230