Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb017bdf9f5c492a…

MALICIOUS

PDF

75.2 KB Created: 2021-03-30 13:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: abcfe550c9bce60786af044faa06f152 SHA-1: 7891ced6f7f2eaf563d8d8fd93d9bd8b4d751710 SHA-256: fb017bdf9f5c492a6f996b3226dccc9a87db4c4d65501f71868865037f5ee40d
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URI pointing to 'nipisod.ru', which is likely a malicious domain used to host a phishing lure or download a secondary payload. The document body, though heavily obfuscated, suggests a technical topic to entice clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=ripple+factor+of+half+wave+rectifier+pdf PDF link annotation
    • https://cdn.sqhk.co/batovafakupo/qidicdU/mepivitut.pdfIn PDF document text
    • https://cdn.sqhk.co/takabalal/dhjgfih/3d_max_interior_design_tutorial_video_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/midusuworab/pejfJuC/bazeminanef.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/numunenoji/59950563976.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/intex_saltwater_pump.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c8657d2-5406-44d0-9309-57c4ac6db157/solution_set_definition_short.pdfIn PDF document text
    • https://cd9ed9ec-87d1-42be-9198-0b2de6c1db4d.filesusr.com/ugd/158fb9_45bb38e10d1b4b93a59975cf87e909e1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/08ea993b-794b-4584-b928-a9f2dd5817b9/p8z77-v_lk_nvme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4521e861-6006-422d-9693-114fbc6df1de/bic_america_f12_setup.pdfIn PDF document text
    • https://137ec283-4f39-487a-83e0-59c384ab9fed.filesusr.com/ugd/c4dbd3_40a283b4d5f04eb7abcdc78ff01bbc01.pdf?index=trueIn PDF document text
    • https://2863666b-9d79-467d-9aad-9eeb6dafbdf2.filesusr.com/ugd/6ee3eb_d43dc30ec4d84ad6b518ae18a3b357d4.pdf?index=trueIn PDF document text
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_382e78f9bb2040f39b2f80054c408206.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/the_death_cure_summary_by_chapter.pdfIn PDF document text
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_11c73ff9dc804c3998153c65d76d7703.pdf?index=trueIn PDF document text
    • https://c38d9960-f3a4-46a0-b266-cfc7836dd0ed.filesusr.com/ugd/a8d9c8_3a7d9e7ff46f4dc586b53fa5d34d9727.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2b51afb-925e-4edb-9c92-1242c0f7db6c/sagelebesanuxi.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/parquet_courts_wide_awake.pdfIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_0ca0217eddd34c7b8ef7b82ff27e48ab.pdf?index=trueIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_2871cb406c7549868bd3f027a7e14c25.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kuboki/can_you_eat_nacho_cheese_on_keto.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_off0000e6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CE 5224 bytes
SHA-256: 5d2525ad60c8a40e2f3efbffc3d639eeec604489673146fd0d220f8a56a314d6
font_01_sfnt_off0000f8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AE 11364 bytes
SHA-256: 4385f83993c22de6876774cee9dff0e36e694fa4108db50c5f3fb7725142107b

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