Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa779900ee5c2ee9…

MALICIOUS

PDF

75.0 KB Created: 2021-03-10 20:42:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: deca9828a53d50e9e29dad98b15deb5e SHA-1: 759c384ad1fb5562a52e523b77d34c607586c95b SHA-256: fa779900ee5c2ee9749c16bd087215aa15fbd20dd6c538ba6da3b3fb314a144d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, directing users to various PDF files on different domains. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the PDF structure point towards an attempt to lure users to malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/award?keyword=halloween+word+search+puzzles+pdf PDF link annotation
    • http://vienvozvrat.site/lowrance_elite_3x_dsi_price6722e.pdfIn PDF document text
    • http://reduslim-sito.site/waliruvefupibireguwixusgx.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeforms.com/baby_boy_and_girl_names_hindu_202008a4a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424376/normal_5feff62e87e8e.pdfIn PDF document text
    • http://smartbright.club/95017507437tapzk.pdfIn PDF document text
    • http://canonsburglake.org/dungeons_and_dragons_character_sheet_doc42kgt.pdfIn PDF document text
    • https://nutotawi.weebly.com/uploads/1/3/0/8/130813366/tivobilejoromopigu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387921/normal_5ff480b995796.pdfIn PDF document text
    • https://bepevefobe.weebly.com/uploads/1/3/4/6/134699504/1c6c99466d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420934/normal_5fcc2a2157e5c.pdfIn PDF document text
    • http://repochka.site/58772853810hxe04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376874/normal_5ffa61e0d64ae.pdfIn PDF document text
    • http://rbqjkwklnd.xyz/804276886133viab.pdfIn PDF document text
    • http://healthit.space/a_pinch_of_salt_poem_answersacnqb.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/bopuxosavubare/chiari_malformation_type_1_with_syringomyelia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b495f48f-24f4-4d6a-8c09-e771700f977a/85309897403.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/devukuxosozididiponi.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/creature_3d_movie_song_320kbps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e268c28-2239-4e67-a417-2f270ffe6606/amplificador_crown_xti_2000_especificaciones.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/ranudu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebcc2b48-7805-4213-8799-50e048b4d917/guturokunepegod.pdfIn PDF document text
    • https://s3.amazonaws.com/rizoli/canon_eos_rebel_t6_manual.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_off0000ea7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7B 5344 bytes
SHA-256: 157fb85372f6924f5c567d7272f26eb186f6861dea987a0ddc8a1931a81bbf7d
font_01_sfnt_off0000fcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBE 9952 bytes
SHA-256: ab4e1c6c286c3408a08ef0192191acc5c6725b22a8a07c5d005c3ad98cc8075e

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