Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf8aa45fd00c5ea…

MALICIOUS

PDF

99.0 KB Created: 2021-03-29 14:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: df8a13e21370cd7733ae561faf30fbaf SHA-1: 0944993d126b5b01ad42a43d12896a38b8840fbf SHA-256: bcf8aa45fd00c5ea959c8f5ba1c9f404f703fcba68711cf655afd6c7aec7e9c1
156 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 0.9986

Heuristics 5

  • 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.
  • 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://dafemum.ru/strik?utm_term=what+are+some+interventions PDF link annotation
    • https://cdn.sqhk.co/rizavoxaje/Kgi3ujj/guide_to_beginning_intermittent_fasting.pdfIn PDF document text
    • https://cdn.sqhk.co/wazilisiko/jfhiEcA/64974307608.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/ighv2eu/galarian_zigzagoon_pokemon_go_shiny.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zidenigad/ge_true_temp_self_cleaning_oven_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ff15378-6eec-499d-9970-2433aa1dbc46/fovukezemivuwafide.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/vosatobukozijudisixebuf.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/mental_math_worksheets_grade_7.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/how_many_tons_of_maize_per_acre.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a817957-9a6b-4145-996b-6191562d6b07/snap_on_2000_psi_pressure_washer_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12a21012-2296-48e3-aace-3663f710a430/sword_art_online_season_4_episode_13_crunchyroll.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea807a8d-3a81-4760-b4d7-f1d2390be73a/pijavojivavivugezog.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/joseph_and_the_amazing_technicolor_dreamcoat_script.pdfIn PDF document text
    • https://fb4bdcd3-28a3-4206-a6c3-fb267f511c23.filesusr.com/ugd/0ad562_026905d23ba2456e8194310811f4495f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/10493344285.pdfIn PDF document text
    • https://ba85394b-11ac-4ca4-926b-74ca936c52e1.filesusr.com/ugd/5ccfc8_aeedede4f1c84db0bd0b5e8f0b12a581.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/051ad578-0854-4f81-bce6-4bb8fe2e893f/72407337824.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fa3281b-44fd-4538-9089-1cbe9a1655ab/kabewarulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48b55e35-40e9-4291-bed7-326153769a60/90045233184.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/zizosazuvaxupirafigarubo.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/bp_meds_guidelines.pdfIn PDF document text
    • https://2dcb0092-dd22-4cef-90c1-8c398f802bb7.filesusr.com/ugd/ff3115_c9b33988dc99471084739ec7026afaf4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddcd408f-860e-469e-8539-c2e1fa083e5d/91567994306.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a36f682d-f531-41b7-be56-a9de56b3818e/what_is_rpa_automation.pdfIn PDF document text
    • https://71a5d838-4e22-4830-8da1-7955ec3365f5.filesusr.com/ugd/f2f43e_d68c83bd8cb24ee6880f12cc58eb4da4.pdf?index=trueIn PDF document text
    • https://9b321a86-0615-40a7-b684-6dced782f4cc.filesusr.com/ugd/e3cae3_8049935cf398412e9208554c964e0004.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
    • 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_off00012f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4B 4968 bytes
SHA-256: 0afcd93158758a60c4f9e54a2b07e67e1096fb7be1c1b2b452df48a8e567dc46
font_01_sfnt_off00014010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14010 11280 bytes
SHA-256: 91ca047047ae00488ba0c087cbfd8f479154c3acfb44b1056ccf7329a4287180
font_02_sfnt_off00016695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16695 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e