Malicious PDF — malware analysis report

Static analysis result for SHA-256 01c8d32b573a3048…

MALICIOUS

PDF

74.9 KB Created: 2021-06-04 11:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 78bacc9ab2d00dec0de728ae290b2ebc SHA-1: ccd6155c7eb85ece2da59fe585784ae1f0593fb0 SHA-256: 01c8d32b573a3048ea845dfdbb7b49775d3ecbd3f876f41733b38b529004ce3c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9991

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://kuzutuzo.ru/123?utm_term=android+sdk+28+release+notes PDF link annotation
    • https://menelaxewo.weebly.com/uploads/1/3/4/3/134362368/9057409.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459029/normal_606e6422f386a.pdfIn PDF document text
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/wukasefifaxet-vaxedaxox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484820/normal_605ba8004a745.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366362/normal_5fc995b841951.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4446017/normal_60b24b0f52d78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452382/normal_602116f3d0ed0.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4416132/normal_60b0c42a207a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481157/normal_601db5311b98a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455198/normal_5fc666c44a068.pdfIn PDF document text
    • https://widafesisitix.weebly.com/uploads/1/3/5/3/135321065/muxor.pdfIn PDF document text
    • https://buxivadoga.weebly.com/uploads/1/3/0/7/130740323/6954688.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384046/normal_5fc71aeec3a8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463266/normal_60490924229e2.pdfIn PDF document text
    • https://sitoluvumoroge.weebly.com/uploads/1/3/4/7/134762666/07822180.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mefijunov.pbworks.com/w/file/fetch/144415641/what_is_vrv_air_conditioning_system.pdfIn PDF document text
    • http://bepisoxu.pbworks.com/w/file/fetch/144435729/rojapumejebikifob.pdfIn PDF document text
    • http://bepisoxu.pbworks.com/w/file/fetch/144594570/letosakokosekugewubi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2385fc7-a3e2-4a38-8bb9-a43811946fba/hp_solution_center_free_download_for_windows_7_32_bit.pdfIn PDF document text
    • http://furalagaposu.pbworks.com/f/18447255071.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fb2d714-8a02-4405-a1e4-5a519e8abf93/who_is_charles_fourier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6ae80c3-5fb9-450f-a726-96f9f1a89818/hidden_figures_picture_book.pdfIn PDF document text
    • http://mukibilevejo.pbworks.com/w/file/fetch/144445323/revuzudusi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/637052bf-3df2-4ae2-9e8c-67cc19e3d4ba/how_to_stop_metal_bunk_beds_from_squeaking.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_off0000e97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97E 5200 bytes
SHA-256: 5b22c845e95141b5d4048d5e54de7d115301efe58efa389058569b64ba9404df
font_01_sfnt_off0000fb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3B 10608 bytes
SHA-256: 4c92b61268c2e58ca8a3fa4d22800c88a2211f7ea98b063ec33ccda07e2eddb0

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