Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c0c7ea14215404…

MALICIOUS

PDF

74.4 KB Created: 2021-06-06 22:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 30933e32dc586123abadf42c64063bde SHA-1: c6c93e61bfd2b80ac54763593ac986711875a9cc SHA-256: 82c0c7ea14215404867afc81ad6788fa26d7079df4e86d573c711600b63b0bb8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 6

  • 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.
  • 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://pixomot.ru/pbw?utm_term=how+to+vectorize+an+image+in+illustrator PDF link annotation
    • https://tewenamizudeko.weebly.com/uploads/1/3/0/8/130873709/5157605.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/4402140.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485149/normal_605398414eebd.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4457857/normal_60b36f6caa808.pdfIn PDF document text
    • https://lafowujokunoro.weebly.com/uploads/1/3/0/7/130738997/929268db9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392457/normal_6012fbc726ec7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416919/normal_600ca8f2bba6a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3496fc2-02a7-4ffb-ba67-092146bfc2dd/2gig_master_installer_code.pdfIn PDF document text
    • http://fufitan.pbworks.com/f/how_to_turn_off_low_battery_notification_ios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a41ffe4e-8f86-4359-ba45-2b7a3fd2dc30/the_promise_of_a_pencil_chapter_3_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b944bb17-7b85-4c49-95cd-263a1b1e7cfe/34115496320.pdfIn PDF document text
    • http://kolelulu.pbworks.com/f/toziwufaxuxob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffd6eb6d-5ea8-40e3-b79a-2a561e0013fc/honda_civic_maintenance_code_a1237.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41740e30-5101-4341-a470-5f1f2d0bd2ef/xajovamefeliberuliluti.pdfIn PDF document text
    • http://pebokuvog.pbworks.com/w/file/fetch/144529572/prescott_microbiology_10th_edition_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/002dd6bf-726c-41ed-97f0-1c8fd43ef758/country_flame_wood_stove_blower.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05e4febc-6e60-4afb-9532-cf3c24c57b29/22343093342.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67688810-5c82-4255-bda4-91fb054a193b/91726532379.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8672739c-27ba-4dfd-991e-3274e703b2da/ejemplos_de_monomios_binomios_trinomios_y_polinomios_resueltos.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_off0000e55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55D 5284 bytes
SHA-256: 630229d86b8e889313d03c45e6121195b227bc02def361a4ac1438a1a70f0b31
font_01_sfnt_off0000f75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75D 10240 bytes
SHA-256: 0f64d7f8d8e284a35d1b0a104defcd95f2fde38c007f87f57a75a150ecbceb51

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