Malicious PDF — malware analysis report

Static analysis result for SHA-256 594c16684ede1c8f…

MALICIOUS

PDF

83.5 KB Created: 2021-06-15 13:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e4bfd74bb4eb0b994648ed24454a615a SHA-1: c7bb3a87483a7ccb48f9651f6d8cd34636d0756e SHA-256: 594c16684ede1c8f57505a579e12d8df56bf252320ac3ebd7bc1b81e4502d4a1
126 Risk Score

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 0.9990

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://laborke.ru/pbw?utm_term=streaming+twilight+saga+eclipse+sub+indo PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483870/normal_5fd18aa8222d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383327/normal_5fc98eba61414.pdfIn PDF document text
    • https://wipiduwofudozi.weebly.com/uploads/1/3/4/5/134588456/demubevugub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416939/normal_5fcd67f5b7089.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369322/normal_601737e2cf857.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365653/normal_600df962d89a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384308/normal_60651b7bc5669.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404523/normal_6066d33c6375d.pdfIn PDF document text
    • https://metaxifal.weebly.com/uploads/1/3/4/3/134311681/zelevis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483856/normal_600da1c4a38ba.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/31047c34-d121-407c-b55b-804bfd8d9274/80917610927.pdfIn PDF document text
    • http://zowonixepor.pbworks.com/w/file/fetch/144681636/ragimub.pdfIn PDF document text
    • http://pazimonofe.pbworks.com/w/file/fetch/144462333/86262628647.pdfIn PDF document text
    • http://muxopal.pbworks.com/w/file/fetch/145245783/adb_driver_installer_windows_7_64_bit.pdfIn PDF document text
    • http://kuperuxowix.pbworks.com/w/file/fetch/144536535/gonuvamudeviborun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bac7cbfd-5e2a-4c5b-86a4-bbe64dd93cfc/diccionario_latin_castellano_online.pdfIn PDF document text
    • http://kobowal.pbworks.com/f/star_wars_d6_fillable_character_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd5a48a6-8d03-4767-92c8-9ac4d76c76f0/zurudewadakexefafud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87d14596-a361-48ea-8b46-1e0c5895d78b/silent_knight_5208_wiring_diagram.pdfIn PDF document text
    • http://sazupamufode.pbworks.com/w/file/fetch/144809883/dorariz.pdfIn PDF document text
    • http://dazixini.pbworks.com/f/18006158013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f114f57e-54d0-4307-aa79-671b15451ada/run_batch_file_from_command_line_windows.pdfIn PDF document text
    • http://mukibilevejo.pbworks.com/f/misopulumasorarugopume.pdfIn PDF document text
    • http://gupiguna.pbworks.com/f/8725342709.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF075 5824 bytes
SHA-256: 0f31e25d91707599693e89709015cab0d749138864d0434412e4b4855094de97
font_01_sfnt_off00010424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10424 10612 bytes
SHA-256: c901da704dfc8048ab974e5f00e69249b928a07080f9175f9d8a08fdd1b3d9ee
font_02_sfnt_off00012888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12888 16208 bytes
SHA-256: f76e53b1165c770ea72ceccb5e808e1d48d2b426d0b5e274530350a00bad707e