Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b993e8b4f37789…

MALICIOUS

PDF

70.3 KB Created: 2020-11-24 17:48:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e1b9caa7b990d052656dee1c04cfc990 SHA-1: dfca731cfef0e74a60f587f3c30f207874e58ce3 SHA-256: 87b993e8b4f377897fa5d21ee7529bad026e580bbb8d5db2657618ea9010aaa5
154 Risk Score
Tags
free-cdn-ebook-manual-lure

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 routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://traffmen.ru/123?utm_term=allison+transmission+trouble+codes In PDF document text
    • https://cdn-cms.f-static.net/uploads/4455673/normal_5fa11d7f88d19.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/muwemivumazulax/wopobugowepunuwiduko.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/what_is_f1_score_in_classification_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/371a9ecd-2c3c-411b-9968-81e688c699e4/vepodudonokejazaremetofek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/125ee166-e08a-4254-b556-52c2d4bcd451/vedof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/177354a6-d0fb-49d7-b643-b14f01efc3ef/98281377647.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/851f0707-3cee-4026-b4d0-05f9e6445310/41036176131.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/super_hero_squad_show_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9571f3ca-aa65-4f35-b3fb-eb4ddb8d9af2/expert_hadoop_administration.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/kyocera_dura_xv_lte_verizon_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40cbbab0-45d5-469d-95d4-756d114aceeb/883156539.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/ygopro_download_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/education_board_result_2017_ssc_marksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9907a5c-91ba-4589-927b-5369600e736d/gukosisowokizebi.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_off0000d859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD859 5216 bytes
SHA-256: d156e558d309705f0f294b6040b9c81d4a1dad0b233b046739f44cde078e6ff5
font_01_sfnt_off0000e9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F6 9968 bytes
SHA-256: 6855bd9c3100462792c06a2b42659c702194ae2f27c88e93b953465a7d980ef0

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