Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d566cb9750d5d0e…

MALICIOUS

PDF

81.4 KB Created: 2021-05-31 05:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8a8a40213da31ab9e39273435830068f SHA-1: 93b6d969332cb7f00a77459b365251c4586918fd SHA-256: 7d566cb9750d5d0edfe7c8613dad1c7b5ced2fa38774f783ae9107e8f1b6ecba
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://xajibur.ru/123?utm_term=lol+graves+jgl+guide PDF link annotation
    • https://milolavum.weebly.com/uploads/1/3/4/7/134717842/nikupaji.pdfIn PDF document text
    • https://xifabaruwene.weebly.com/uploads/1/3/0/9/130969291/8838554.pdfIn PDF document text
    • https://remejatezikame.weebly.com/uploads/1/3/1/0/131070309/koxemunipebutopipi.pdfIn PDF document text
    • https://komakuzafoge.weebly.com/uploads/1/3/4/5/134576335/edc9e30729a5c.pdfIn PDF document text
    • https://zowunezumo.weebly.com/uploads/1/3/4/7/134776365/4486328.pdfIn PDF document text
    • https://pagomowe.weebly.com/uploads/1/3/4/6/134608852/9995912.pdfIn PDF document text
    • https://zoxofaduw.weebly.com/uploads/1/3/2/6/132683138/beruxozakabunad.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/8ae54467-6985-460f-9a5b-ab09bad8cbb1/zebra_gk420d_driver_install.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99c56755-6d10-4489-be14-3beea7d9ed19/fekozaxaretemoxab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99765658-76e8-45b7-be44-1bfefda8cc08/97272934489.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fa7063b-7bc3-4374-8a5d-0ab061245b9c/liftmaster_387lm_keypad_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fd106c5-abba-445d-9d2c-95e97cf496a0/what_is_the_story_of_antigone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adfe6b8c-6feb-427e-8c75-692bcfde187e/sogonigatabavupujijisu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f387474-e823-41ee-ae68-d05ef7e902cf/65917965705.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32ff4b61-2aef-4f70-ab3a-befa8c6af3ab/32754324520.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06904592-55fa-4bf6-b4a6-330ef9122e2f/diy_cardboard_car_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6d040f3-add8-4de6-8bc5-4e635abc0346/how_to_remove_mobile_home_countertops.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07a35c0f-0d4c-49b1-9fad-cbcd53bfaa9d/morinurof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d69299e-bfac-4844-bca8-2d44021cb40b/how_to_reset_a_c1100t_modem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e175dcd-1128-425a-8ee4-83f4fb9a172f/nelofifunawomup.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10255 5072 bytes
SHA-256: 387f08d089880a22208d7bc5b4fcb04948f6c83406c97ceded783b176ea52b67
font_01_sfnt_off000113b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B2 10904 bytes
SHA-256: fd812ddcc39954e169f77c4570cc11c1a6d4a577cc2844e9c12fdf56ba3756f9