Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64783168686db5a…

MALICIOUS

PDF

79.1 KB Created: 2021-03-21 22:02:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 924a5d6cfa377491343e5d87e14090c9 SHA-1: e62ac78ae058cc79b7285d55434c930f85c47447 SHA-256: b64783168686db5a408dea14fdfe1f430c8862a846c88089bf431e6207a1c79b
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with a primary URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious sites for credential harvesting or malware distribution.

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://soxebez.ru/strik?utm_term=homeready+qualifying+income PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380525/normal_604cc22d2b7c7.pdfIn PDF document text
    • http://silkhfig.bid/rexomawugaxadonevakeligoxa3ne.pdfIn PDF document text
    • http://greyfruit.space/invaluable_meaning_in_english_oxfordq1ns0.pdfIn PDF document text
    • http://ergors.space/gudenisaganuvobsv851.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426953/normal_60355a7a1f160.pdfIn PDF document text
    • http://esclick.pro/can_exercises_cure_scoliosisoccu9.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://82c1a4a6-0aea-44ab-842b-07cb5bdde860.filesusr.com/ugd/aafee9_b710bbb5b83a43e6a591c2de4565ff5f.pdf?index=trueIn PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_b8b450ba6db640ecb5465203ce26139d.pdf?index=trueIn PDF document text
    • https://c78ffd2e-fc3d-4272-86ca-968d835fb7ad.filesusr.com/ugd/0f9ef0_8777041613004032a2a98d7fb4ad4763.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/32b724f8-3b56-4906-a1f9-dec21bc41e79/xotexaruxanupikejuneb.pdfIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_25537e825bd24aa18fc1ec4f46e8bbc0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a06f584-a5f3-4c1d-9f83-1156c6ce8f53/subject_and_predicate_worksheet_grade_1.pdfIn PDF document text
    • https://587b455d-cc79-4428-8e80-a8b75ce23bca.filesusr.com/ugd/021ec8_1ae7f94c31f046bb8ea5a8a3fc32a2ba.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cb988bc-0d03-4fd7-833f-79962f0fa120/which_of_the_following_represents_electron_configuration_that_violates_the_pauli_exclusion_principle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37562c57-a653-47b7-a595-760eea439b37/70684958450.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ce34360-5603-4a29-8653-66e9c45a1e19/mixing_with_your_mind_free.pdfIn PDF document text
    • https://3485775d-af35-4505-8fb4-f6750f575e04.filesusr.com/ugd/42f18e_55403e34c89d43c1bc500776d95f2e18.pdf?index=trueIn PDF document text
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_74890d8b74c04cb296a0e3999f4f88f3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1558ff3e-e6a6-4214-aeb3-1e2028ffab8d/powershell_command_prompt_windows_7.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_off0000e9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D0 5156 bytes
SHA-256: e70fa1de8a0e5b6bd940ba06ed0264ffd98682569a2cf415070e564644a463de
font_01_sfnt_off0000fb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB33 11196 bytes
SHA-256: 31f06f15c3f67b0c26f4427d81a848a45a3124a8d7cffbc320a9f57d54e047a2
font_02_sfnt_off00012138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12138 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3