Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde0b25689453710…

MALICIOUS

PDF

87.6 KB Created: 2021-03-21 02:36:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 24681721c3fe6c6daa1b7c2ee6c74fc5 SHA-1: 9b5e5a0a705c637ac4b194908a66447e3f8b0f75 SHA-256: cde0b25689453710aada07a8dbcaea284872e6cfa7198f7a0613744d7f392bd8
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 0.9983

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=samsung+hw-f550+power+cord PDF link annotation
    • http://pycnidwzxc.info/siyahamba_lyrics_and_musick3v32.pdfIn PDF document text
    • http://pearhaidhr.fun/sulobefawesoweu3wnv.pdfIn PDF document text
    • http://kyhni.site/cansat_2018_mission_guidey26x1.pdfIn PDF document text
    • http://reduslim-shop.site/zora_neale_hurston_their_eyes_were_watching_god2k9oa.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/sojaxub/xusifofamexovejokufame.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/android_games_mob._org.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/72753666776.pdfIn PDF document text
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_371f7c2aeaf24565a9f269f1336b57c9.pdf?index=trueIn PDF document text
    • https://089130c0-62ae-4bf1-a93c-656440fe8451.filesusr.com/ugd/738632_d8dc1b2024ca47c18ab9b6610ad58006.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/42512cf2-9804-47d9-a204-27d642d1c50f/23283607437.pdfIn PDF document text
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_f4052dc75dc74925b7e31b1491ec62c6.pdf?index=trueIn PDF document text
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_ab1d5c85fc2349bc920bb155ddd98c9a.pdf?index=trueIn PDF document text
    • https://fe426b01-1dd0-498a-b08e-7ec37e320b94.filesusr.com/ugd/6b45f0_af466b0076064f358a6d7d4260eba04a.pdf?index=trueIn PDF document text
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_98f1c31179114ad28db15bad9ba480da.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/chrysler_sebring_convertible_2004_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/biometric_facial_recognition_software.pdfIn PDF document text
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_7783d5b00586403ea2e297022b1a7666.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0250ee19-7397-4db6-b2f5-f6a51c68ce4e/football_conditioning_workouts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92cb8a1c-511f-49d7-bb59-2df9636ada7d/ancient_greece_olympic_games_lesson_plans.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/cheap_thrills_lyrics_naa_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/befuwewubiwukaguzowo.pdfIn PDF document text
    • https://8d94caac-80d5-4f6d-a73a-04ed47837dc1.filesusr.com/ugd/585b1d_eea7c7ee6103498f89cc89674111a9cb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/26eb7ab7-354b-4e19-9f14-fec3d61daa60/why_students_do_not_follow_school_rules_research.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D1 2996 bytes
SHA-256: 91c65d4daef29bab276e56b606f9c5013e4f13bc29c78e9eee33dd87ab02342c
font_01_sfnt_off0000fc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC95 6032 bytes
SHA-256: ccb44ef645349a6f2cc078e22757c4a6fdea245792ce461981ffb7434bbaf041
font_02_sfnt_off0001110e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110E 12236 bytes
SHA-256: 5e28180ba833f81fcee3e784664e803ef6f062af8eb16bebf32ea8259f93e749
font_03_sfnt_off00013a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9E 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e