Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d9c7439f328cec…

MALICIOUS

PDF

74.8 KB Created: 2021-04-20 08:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0d5a8fbf1b8af2c77d57b0c09d087b25 SHA-1: 535f77407730aa188913275b28476cfed5659217 SHA-256: d3d9c7439f328cec79d5aa1c0ee729b62472431b6313540af7f7ca0eb5f6bec8
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 0.9992

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://baarspo.ru/strik?utm_term=how+to+write+a+paragraph+in+excel+cell PDF link annotation
    • https://cdn.sqhk.co/bularalunop/iahaij6/motogp_20_nintendo_switch_game.pdfIn PDF document text
    • https://cdn.sqhk.co/goworonol/hNhgqgf/hill_climb_racing_app_free_download.pdfIn PDF document text
    • http://vknacruckalaikov123.xyz/47068767860k17d8.pdfIn PDF document text
    • http://50offshop.pro/lefokorakigovanobinohkdn4.pdfIn PDF document text
    • http://helper-badges.com/tukomu3rkax.pdfIn PDF document text
    • http://digitalmicroteter.xyz/genetic_test_review_answer_key7fp4a.pdfIn PDF document text
    • https://letosuve.weebly.com/uploads/1/3/0/7/130739520/7442698.pdfIn PDF document text
    • https://gofolepoxi.weebly.com/uploads/1/3/4/8/134882907/05ba4abf9750.pdfIn PDF document text
    • https://cdn.sqhk.co/zezerixuwab/itRhfvI/vulalulus.pdfIn PDF document text
    • http://energytik.net/download_game_playboy_mansion_pc_full_versionpqckj.pdfIn PDF document text
    • https://cdn.sqhk.co/zidodovare/vLsifjg/47049161836.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/mukut/zajinapafenuvipuzap.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/vuvukijorusepirajiwokasu.pdfIn PDF document text
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_8ddac5b091d7470bbea583b7d4f52a87.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xopugup/17314182171.pdfIn PDF document text
    • https://964beff5-d24f-450a-94e2-fa7e9faef44a.filesusr.com/ugd/61158f_924df9c5721f4dd0af807319ff37f164.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisazabe/januvibidutusekifujup.pdfIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_f4bdaaa5042a43bbaffa965c1eb0eadc.pdf?index=trueIn PDF document text
    • https://e18e6c05-101e-4f41-9c4d-f518aea09dbb.filesusr.com/ugd/7972b3_7fd9421b70644c30a9a3f1b027e6ed74.pdf?index=trueIn PDF document text
    • https://0a3880f2-9bda-4900-b484-73a003b8a878.filesusr.com/ugd/3cbe5d_f14f517bef524e62a02dc7d285e72f47.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/avg_secure_vpn_apk_cracked.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/manekur.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/artemis_fowl_movie.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_off0000e4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CB 5136 bytes
SHA-256: 2d3684343ef7f34806598c959243a209875e701e5fea4d156a6d995f4d8e8dd9
font_01_sfnt_off0000f657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF657 10976 bytes
SHA-256: 59bf52e25d8b7b9d59937297160b794d673257d54747da69285b14016c1ab38e

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