Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf5b888fecd8d8c…

MALICIOUS

PDF

73.7 KB Created: 2021-04-03 22:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 00e667daebc657996966f5108d57b261 SHA-1: 189e1f6f7139a997ea460b79b3920345cac713ec SHA-256: 0bf5b888fecd8d8c3e2942bbbe1d2f66185982621d4c06e8dd42077312499d33
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 0.9995

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://botokaw.ru/123?utm_term=bluestacks+cho+win+7+64bit PDF link annotation
    • http://omoikiri.info/facebook_page_recovery_linkoz359.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/79553054307.pdfIn PDF document text
    • http://pmaider.com/15.0_minecraft_apk_cepde_netghvmp.pdfIn PDF document text
    • http://technodom11.com/how_to_not_be_an_average_person_hold_a_plank68dfn.pdfIn PDF document text
    • http://mon-compte-cmb.best/68520578062x3fy0.pdfIn PDF document text
    • http://vitonidero.medianewsonline.com/farmer_boy_laura_ingalls_wilder_recipes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jibimom.myartsonline.com/bilingualism_language_and_cognition.pdfIn PDF document text
    • https://945c5b1a-9feb-4a08-b72d-c905ca1b1520.filesusr.com/ugd/27135d_89a9314f621b458bb7e536bded84a009.pdf?index=trueIn PDF document text
    • https://989eff4c-946f-4221-9817-1a8d60f2082d.filesusr.com/ugd/7edf14_1bdd5729f2ad47f7a4de945475eea103.pdf?index=trueIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_bf1453ee479046d0a4a5c21bc7e612c3.pdf?index=trueIn PDF document text
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_316dc2082fe1488d86777af427b38779.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/95be8377-79d1-4d5c-9f98-c979855142e8/palm_oil_fuel_ash_as_filler.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d8ffc07-d364-4a5f-bdf9-87d98b8b031b/vatogesesose.pdfIn PDF document text
    • http://xepatodop.onlinewebshop.net/business_law_case_study_examples.pdfIn PDF document text
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_4100d6043d0c4272b2c9a8186eeec522.pdf?index=trueIn PDF document text
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_8d69a19aecb04b5eb54775b790724e2d.pdf?index=trueIn PDF document text
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_6d2344edee48410381ec71b8efe699ea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ea97794-ce95-47eb-a299-3ebbeca9b4c9/63082375688.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4cf3dbb-ef39-4852-ab8e-79f5b4ecf0ff/different_types_of_psychological_tests.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ff873bd-4122-4689-90be-bc91c01f6739/que_es_una_linea_de_tiempo_y_para_que_se_utiliza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1c041fe-f166-449f-a3be-b64b5ada0fd9/samuel_beckett_bridge_at_night.pdfIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_74421551f1e34d9da97e9766900796a5.pdf?index=trueIn 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_off0000ddbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBB 5456 bytes
SHA-256: b38cda1edddf0ef5e6b5ec2822c31781d0b02f4710879cd7af460d4e0edac886
font_01_sfnt_off0000f06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06C 13812 bytes
SHA-256: 63a794a1029a472d84262b6000ef059e1a16ecf08b9f055fe80d4bac8e183460