Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f2023785c975ee3…

MALICIOUS

PDF

73.3 KB Created: 2021-05-30 13:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e30087b6c5442c8ae0b8bc3014d977b SHA-1: 4a7d2eb1c97f2f25f317674a74a0919da7cf2e23 SHA-256: 6f2023785c975ee39bc8585f87abda2cb4a5c2c1b74e3155139802ff8075bf25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, a common tactic for SEO farms or to redirect users to malicious sites. The heuristic PDF_SEO_LINK_FARM specifically flags this behavior, indicating a large number of external links. The ML classifier and ClamAV also strongly indicate maliciousness. The primary IOC is the external URL https://jottigo.ru/strik?utm_term=how+do+i+get+my+own+coat+of+arms, which is likely the intended destination for the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=how+do+i+get+my+own+coat+of+arms
    • https://static.s123-cdn-static.com/uploads/4458849/normal_5fc7d8ef37e0c.pdf
    • https://cdn-cms.f-static.net/uploads/4387233/normal_6067291ee9ced.pdf
    • https://cdn-cms.f-static.net/uploads/4465007/normal_604d95674710f.pdf
    • https://static.s123-cdn-static.com/uploads/4422135/normal_5fc7620e0226c.pdf
    • https://tagopebarezixog.weebly.com/uploads/1/3/1/6/131607889/3821966.pdf
    • https://cdn-cms.f-static.net/uploads/4380392/normal_5fd7d394697ff.pdf
    • https://rexuvaxap.weebly.com/uploads/1/3/5/2/135297240/xiroxisuwofo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3d22a6d5-6ba9-4a01-9182-dd87910a46a2/xelif.pdf
    • https://uploads.strikinglycdn.com/files/50f6e72b-6a92-4dd9-9040-9014a4a44488/midnight_sister_souljah_audiobook.pdf
    • https://uploads.strikinglycdn.com/files/519d2c01-e288-496c-bcab-2a1bc38284fc/what_are_the_5_stages_of_writing_process.pdf
    • https://uploads.strikinglycdn.com/files/cff41be7-3493-47e7-864b-2ae476132a7f/capitulo_2b_que_hicieron_answers.pdf
    • https://uploads.strikinglycdn.com/files/2d753b81-1a62-408a-9558-d707553e85dd/blueprint_for_progress_free.pdf
    • https://uploads.strikinglycdn.com/files/0a9c331c-e6ee-4442-bd99-5276a1ab69ad/denugosurokeva.pdf
    • https://uploads.strikinglycdn.com/files/c6b69d65-860b-491e-9d37-7dfd22511c25/how_to_give_a_sales_presentation_for_an_interview.pdf
    • https://uploads.strikinglycdn.com/files/6a75e0f1-1bb8-40c2-85a0-7fc7c0479c75/book_review_tuesdays_with_morrie_by_mitch_albom.pdf
    • https://uploads.strikinglycdn.com/files/e7062a63-c123-4ad0-bbce-d5f1044de094/1612296453.pdf
    • https://uploads.strikinglycdn.com/files/7768b9b7-8aea-4efd-ad3c-93384a45d4d6/supreme_duelist_stickman_mod_apk_1.9.5.pdf
    • https://uploads.strikinglycdn.com/files/58e11278-f7cb-4fac-be4c-52f0a53c8b41/soundlogic_xt_bluetooth_rechargeable_true_wireless_earbuds.pdf
    • https://uploads.strikinglycdn.com/files/4abca115-544a-4481-bd90-ee54ed6e65a3/25566191821.pdf
    • https://uploads.strikinglycdn.com/files/34ccb409-be31-48c3-8bf4-e79812ba7878/how_long_to_charge_motorola_walkie_talkie.pdf
    • https://uploads.strikinglycdn.com/files/1e0354db-4cbd-42e4-bd0b-e8cebc6e23c1/gorerinonisijuse.pdf
    • https://uploads.strikinglycdn.com/files/2196aed8-8ca3-4d6e-bd00-3745b263b0eb/rebecca_daphne_du_maurier_book_summary.pdf
    • https://uploads.strikinglycdn.com/files/e96a0fe6-76c8-4f46-96f3-3df62230aa13/65827474136.pdf
    • https://uploads.strikinglycdn.com/files/b7ab007d-6d2c-4b32-a3a1-4740ca47b5e8/o_praise_the_name_anastasis_chords.pdf
    • https://uploads.strikinglycdn.com/files/4004ed2a-0c60-43d9-879c-b9a5e516f1ba/time_management_tips_for_working_parents.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df5b.bin
c8ea0ebd1a70557ff68ed40b28c56220dda0b44c8a46f38b9398fac6fc26f304
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5B 5464 bytes
font_01_sfnt_off0000f1f7.bin
968ec154d3a45ac354b9e0ac30c49f5b1bec722646e472626e89242ffbc6c54a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F7 11116 bytes