Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f521c1d8a325a3…

MALICIOUS

PDF

83.4 KB Created: 2021-06-10 19:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 896211a2c11bb8c99ebbdcc9729c06da SHA-1: 40560099e0153a277593510dad49d9dc0fae7c80 SHA-256: b8f521c1d8a325a36005862c6a84e63aeb96430e501a9e9abd0e2ea776ed3317
226 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of a 'Password-protected archive handoff' heuristic suggests a common tactic to bypass security scanning by encrypting a payload, which is then intended to be decrypted by the user, likely after being directed to one of the external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • 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://drafthe.ru/pbw?utm_term=chrome+store+touch+vpn PDF link annotation
    • https://batarodev.weebly.com/uploads/1/3/1/3/131380453/leluvita.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450890/normal_603aaaa364ec6.pdfIn PDF document text
    • https://zavetogodafewer.weebly.com/uploads/1/3/4/7/134709275/6106702.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379605/normal_606000341798c.pdfIn PDF document text
    • https://watumuguv.weebly.com/uploads/1/3/2/6/132695830/f3c76c441.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471512/normal_5fdba9022bbe6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404490/normal_604ae321425cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384295/normal_60295805c2b9b.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/e2552515-fe00-4f34-a4ad-8c544f3ce017/36065971306.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9607d653-57e4-4c81-8a48-67cb9feebc22/kk_fit_bulking_program.pdfIn PDF document text
    • http://jukozatixul.pbworks.com/f/naruto_vs_bleach_8.0.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffde13c9-1237-4c02-84b3-29e551be5671/gijovapenofunowo.pdfIn PDF document text
    • http://rerikisozid.pbworks.com/w/file/fetch/144893286/monkey_go_happy_2_unblocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44d1cb0f-9c0f-4a0b-af7f-e3135ba41754/tuxesufesav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ffdf514-573e-49b3-8cac-46d055db2f8a/convert_photo_to_paint_by_number_pattern.pdfIn PDF document text
    • http://dekokos.pbworks.com/w/file/fetch/144416838/zudarilotunaketa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c33ce71-491b-433f-a57b-a586741d82e0/beats_studio_3_wireless_price_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f364d4e5-0ea2-497e-aee7-a902b7bfc76c/45841444128.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/beede6b6-2c01-4558-a749-e0a0af7338cc/46788080998.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ab8bebb-3468-4e12-bfc1-8b7ae51d53c6/the_monkees_2018_christmas_album.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03473c55-c487-449d-a687-ff0ec7de56a0/what_is_an_example_of_a_specific_purpose_statement.pdfIn PDF document text
    • http://xosezoranad.pbworks.com/w/file/fetch/144870474/10644416968.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02ac3c2e-dada-467c-88d7-cd8ac07de6a2/civil_engineering_drawing_book_by_v_b_sikka_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c94a43fd-20d8-408c-86e2-f5f2b472547b/pesusamerutufafu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDE 4896 bytes
SHA-256: 84ccae554bf1a6e25d56d7a312a4ffda752b73c5e8e4642b93a9906bb370cb5f
font_01_sfnt_off0000ff67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF67 13184 bytes
SHA-256: 172755cbac100b826a504547b65acfc59b725a6753be294b1753e2c052dc5f9c
font_02_sfnt_off00012a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2D 16200 bytes
SHA-256: 6093906a330fe342aa11da9684af10625c07b8e47180e3cf9f2ea115bbdf2618