Malicious PDF — malware analysis report

Static analysis result for SHA-256 e08b3296d8457ac6…

MALICIOUS

PDF

84.6 KB Created: 2021-04-02 10:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cdfcbb6d1b96f74a74bf743e2f40cf74 SHA-1: 29ced7a36dbe5e836892c1b983c00c4403056f6a SHA-256: e08b3296d8457ac60d7950f00ad5e1b4cb844838b00758907d19783bcf9bcfb3
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a clipboard-command (paste-and-run) lure. 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 7

  • 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 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://dafemum.ru/strik?utm_term=why+is+my+kenmore+dryer+not+heating+up PDF link annotation
    • http://olivamebel.com/jimilatarorezawozogaleshe7q.pdfIn PDF document text
    • http://copyrightproblem.com/asma_bronquial_pediatria_2018jwrks.pdfIn PDF document text
    • https://cdn.sqhk.co/lutuganoda/ieGhdVO/armaan_malik_new_song_download_mymp3song.pdfIn PDF document text
    • http://bigpleasure.ru/gapezopden2.pdfIn PDF document text
    • http://nebo-baikala.ru/lifawiwetigafasetud2ikyk.pdfIn PDF document text
    • https://cdn.sqhk.co/gazamara/iidhjjI/93137122731.pdfIn PDF document text
    • http://cadenalia.com/wimib7tpun.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/75a223d5-61a6-4b17-ba71-062b625ceb7b/everstar_portable_air_conditioner_mpm2-10cr-bb6.pdfIn PDF document text
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_9cc8c106e70448639560ab28c9051551.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b18f67a-0772-437f-8258-b6ad66785b2f/serato_ddj_sx2_driver_free_download.pdfIn PDF document text
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_0477ff55cd4e4ed09393208d72200d8f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/14511173-3f67-4f86-ac5e-cdeadcd94c5b/que_es_la_planeacion_financiera_a_largo_plazo.pdfIn PDF document text
    • https://a9f3490c-def6-45ea-9957-aefa341d54bd.filesusr.com/ugd/84b587_e1d27b4428c6484898e7a48bc23e9234.pdf?index=trueIn PDF document text
    • https://b6de9e3f-c562-4e05-b5ee-70895c8060ae.filesusr.com/ugd/3801ff_9e5541140ca34e2d84b59e99f88abed8.pdf?index=trueIn PDF document text
    • https://836291d8-7b77-40db-be8c-3105928c7ef3.filesusr.com/ugd/aae074_1859f8a1797e435ab9142253cca0871e.pdf?index=trueIn PDF document text
    • https://b993c520-4fc9-488d-8dda-35d8b3dc2713.filesusr.com/ugd/6f5492_7ce898bdf2684ec5b738cadf2a338816.pdf?index=trueIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_3e29c7d2a3834f9b862b6076aef39594.pdf?index=trueIn PDF document text
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_c058ff8698814b24976ee7a745c7b405.pdf?index=trueIn PDF document text
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_7bdcc0460de94410899168fd2edb16eb.pdf?index=trueIn PDF document text
    • https://9dc8676a-0e58-44ee-a512-e339c7094702.filesusr.com/ugd/7c0652_62d52e77cb9e4c038f6ea46377a603db.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_off00010bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCB 5520 bytes
SHA-256: 6c438a948bce74b19d56741b734189894f45033736b21e079cb12bbdde267751
font_01_sfnt_off00011e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7C 11388 bytes
SHA-256: 74ec81cddd6599384ca8b884655ea45207d0bc37b05e50027f9cf4c62d5d949e