Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a123f70651b794f…

MALICIOUS

PDF

80.7 KB Created: 2021-03-14 05:30:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 9a506d69dabbd9a49c27bd6c71185063 SHA-1: de5e227adda51d5c258eda838a0ce55be514539b SHA-256: 3a123f70651b794f03f4a89598ad7dbd8999209a4e417f82e4c1a8cf36900218
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URIs, with one pointing to 'nipisod.ru', which is associated with a keyword search, suggesting a phishing or malware distribution lure. The presence of a 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports the attack pattern of using a large number of links on disposable hosting to obscure malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://nipisod.ru/wix?keyword=rwby+team+sssn+vs+ndgo PDF link annotation
    • http://roxelejabojafe.scienceontheweb.net/reading_scales_worksheets_year_4_australia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_5fe7f75b4e18d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501804/normal_5fe0adf8840bf.pdfIn PDF document text
    • http://vawurabel.mygamesonline.org/dafudaliw.pdfIn PDF document text
    • http://xenuponominabek.iblogger.org/does_sword_art_online_have_a_season_3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muluwokixo.onlinewebshop.net/calzada_definicion.pdfIn PDF document text
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_69b2f47924a64047911c30ac0aca8579.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/how_to_write_findings_in_research_conclusions_and_recommendations.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/driver_bst_dongle_terbaru.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/how_to_port_my_phone_number_to_magicjack.pdfIn PDF document text
    • https://71347f20-8353-4153-bebc-dd2a28b3a5cf.filesusr.com/ugd/a382ee_d7e27b5c574444adb7b295c32a6f6bc9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sabegokek/citation_davis_drug_guide.pdfIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_12414e0e65cf4a49867729a43b7d22ad.pdf?index=trueIn PDF document text
    • http://vigukesege.epizy.com/exam_ref_70-483_programming_in_c_2nd_edition_download.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/motu_patlu_new_bangla_cartoon.pdfIn PDF document text
    • http://wazuvolixevafo.rf.gd/waste_to_energy_meaning.pdfIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_97620fbba5094ec584449f0b301a4c9e.pdf?index=trueIn PDF document text
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_7483b81ff40a47df83ade32598905bd0.pdf?index=trueIn PDF document text
    • http://milebulijulami.onlinewebshop.net/4580364033.pdfIn PDF document text
    • http://zurutoraxavifes.rf.gd/church_monthly_newsletter_templates.pdfIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_c036f57fabb6468596962c21558a4311.pdf?index=trueIn PDF document text
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_b03f780f84674874ab7e7ed4dcf51ae2.pdf?index=trueIn PDF document text
    • https://45b0b119-5f8c-43e7-b437-4e12d17c1c81.filesusr.com/ugd/3826db_4981d86f14dc4454bbb2b7266d4599a7.pdf?index=trueIn PDF document text
    • http://gawupuzilolo.epizy.com/mibaris.pdfIn PDF document text
    • https://598a1783-db1d-4ebb-96f5-d3ad23e1e090.filesusr.com/ugd/ae99eb_41b08a4d63d643959e11a91dbed9128c.pdf?index=trueIn 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_off0000fc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC15 5416 bytes
SHA-256: b5cc1d06aa324b88943a5d82f88bef676a4388368da400d3ca02d6fe11b4290b
font_01_sfnt_off00010e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E97 11288 bytes
SHA-256: a58a812e5351605bfa7bc7ea6aa7cb3c8c3962ee736fee78eef770a2db355b27

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