Malicious PDF — malware analysis report

Static analysis result for SHA-256 35bebcf77c6459c9…

MALICIOUS

PDF

77.2 KB Created: 2021-04-03 16:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e149d10bfb0b6326d733a21fdba70245 SHA-1: 2147e3e301008759beb152040885879b83b9c304 SHA-256: 35bebcf77c6459c986ad09d92ebc1d6c641c6121cb82961a29630ac06e9c3118
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are disguised as legitimate resources, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself is indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://fokemale.ru/award?keyword=career+psychometric+test+pdf PDF link annotation
    • https://cdn.sqhk.co/bataseset/x0iOqjb/free_penalty_kick_soccer_games.pdfIn PDF document text
    • https://cdn.sqhk.co/baxotonad/iir7LAo/352565884.pdfIn PDF document text
    • https://cdn.sqhk.co/kujexelorite/QiejjuJ/dungeon_crusher_altar_heroes.pdfIn PDF document text
    • https://cdn.sqhk.co/mukutosi/b6ghfgh/zombies_run_wikipedia.pdfIn PDF document text
    • https://cdn.sqhk.co/bapulofuw/txBBUgj/king_tongue_2_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/mulepava/fojcghg/wubojorutimexirifepanivon.pdfIn PDF document text
    • https://cdn.sqhk.co/fafaviwi/39hjcdK/39019029448.pdfIn PDF document text
    • https://cdn.sqhk.co/nigalasiline/csgeghh/18850737529.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b564fea6-732e-489f-a029-a72dc6590de2.filesusr.com/ugd/6a4619_f2f85d812f0d4637ae4bec23aee5aef1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/38bb6cdf-6358-4185-b477-b67995c56686/kisiwutusuwax.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/data_science_degree_berkeley.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/nelevutet.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/jexiparojupiwofosinalod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5110ed6d-4b02-4c5e-9151-f7cfcedabbc4/24009572117.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb0bcf2e-a36c-4d82-bf94-42fea257b627/vilowe.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/snowbear_8000_trailer_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f43c581c-2bee-4bcd-ba60-001ebd743afb/samsung_galaxy_s9_plus_copy_price_in_pakistan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce55bf89-5bec-48fd-b25c-4ee4bd485afd/data_structures_cheat_sheet_c.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/82177855502.pdfIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_f4784885256d4f2699a2c16b5ac759ea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sigobija/57535558413.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/additional_mathematics_360_textbook_answers.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_off0000ef92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF92 5368 bytes
SHA-256: 14497b20592e0baf92c5c0c9bb954ffd2718bcc7a69616d860e2cafd08a1353a
font_01_sfnt_off000101b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B1 11084 bytes
SHA-256: 9901559b0c8f90d3fdbe76c3090e8bb777b139c8167a107af9b98a006300a85a

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