Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2fc39a046012525…

MALICIOUS

PDF

67.2 KB Created: 2021-03-21 22:16:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a1abb43b88a1a0f81ed2b6ce90985b56 SHA-1: 5d4658473f3eca9637b8b5e70f512ad5acfd1057 SHA-256: f2fc39a04601252547f6a320f5abcd33ff1f5072dcbd06723f136a7cab9fdb47
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 0.9998

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://leonvi.ru/strik?utm_term=culpa+de+la+vaca+en+ingles PDF link annotation
    • http://bakigamokesu.22web.org/thick_clear_flexible_plastic_sheets.pdfIn PDF document text
    • http://deronagebe.iblogger.org/installation_of_cost_accounting_system.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_01e9c319b50f4205ba03ac4040fa7759.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/mophie_juice_pack_manual.pdfIn PDF document text
    • https://16fd32d6-95e0-4b29-89ad-7162b4f2ffbe.filesusr.com/ugd/9f4b57_8d16193eaba54e0ba9e2e7aaa20135cf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wetevali/cuando_lo_que_dios_hace_no_tiene_sentido.pdfIn PDF document text
    • http://juvokumepi.rf.gd/riluzudejasidibavil.pdfIn PDF document text
    • https://8ed6bd9f-de2b-4923-b7df-82f95eb18a03.filesusr.com/ugd/7fa32f_e13157174063436da76c54953c7effd0.pdf?index=trueIn PDF document text
    • http://retitizuwelis.epizy.com/15795511004.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/acuerdo_de_cartagena_madera.pdfIn PDF document text
    • https://105d84dd-9b22-4355-af37-21382b2db671.filesusr.com/ugd/f4243a_740d0c9c42ad445f946437354fa8eeb6.pdf?index=trueIn PDF document text
    • https://d52369c8-37f2-40d9-9d5f-d682b3b4a2e4.filesusr.com/ugd/6d5a7b_1103096fa8304acab9db51c086bcacbe.pdf?index=trueIn PDF document text
    • https://13cfbe10-32e4-4d7a-9072-8dbd3280e6b8.filesusr.com/ugd/994e9e_6e4ed797f5d54a3180c8eb49b0700e8b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jiwisi/aerosmith_dream_on_piano_sheet_music.pdfIn PDF document text
    • http://rebogarupoza.epizy.com/metro_uk_newspaper_cryptic_crossword_answers.pdfIn PDF document text
    • http://junimufik.epizy.com/mowukojefiwa.pdfIn PDF document text
    • https://s3.amazonaws.com/gonasidupij/4233022864.pdfIn PDF document text
    • https://a1d1c4ac-cf1d-4c58-861c-45d1188f4b60.filesusr.com/ugd/052f3a_65a763f35500459c9428b96157874324.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/turip/82516053001.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/faveranugaxa.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_off0000caeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEB 5108 bytes
SHA-256: a22b2614c76a450cc830590472886bf405c9ef9f79ed8252d9058583842ddcf8
font_01_sfnt_off0000dc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC67 10300 bytes
SHA-256: a80d915b4a2d54275a95a12192aa796a0cebeecfefc859f601886e43e4186cab

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