Malicious PDF — malware analysis report

Static analysis result for SHA-256 9caa51d140e0fd35…

MALICIOUS

PDF

76.4 KB Created: 2021-03-18 10:35:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c66c88bc5b5520ae2af82792134b5ecc SHA-1: 7234edb4854f2f6472b06571c349523c174a6359 SHA-256: 9caa51d140e0fd355de6b1c7146f06b1bb20bd3d56580eb47ae40582b60cb9c6
196 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. It uses a LOLBin command-execution 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 0.9996

Heuristics 6

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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/award?keyword=ayurvedic+weight+loss+diet+chart+pdf PDF link annotation
    • http://bioforcecolumbia.site/wubokutugikijolokomefuwer9cr1.pdfIn PDF document text
    • http://milky-rp.space/80088533862qh7ht.pdfIn PDF document text
    • http://mexicotop.xyz/what_is_mep_shop_drawingsdfacd.pdfIn PDF document text
    • http://idealica-italiaofficial.site/windows_powershell_ise_download_windows_8.1gzwkq.pdfIn PDF document text
    • http://daravto18.ru/gta_4_pspnz5yh.pdfIn PDF document text
    • http://paktum.pro/1075788066494n1v.pdfIn PDF document text
    • http://xtw2.club/callanetics_bungenoo79e.pdfIn PDF document text
    • http://daravto1In macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_89c47ca007fe41009c817622f2ada0ed.pdf?index=trueIn PDF document text
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_4b0510de46a046a7ba8782f0d9cd40b5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/719668bd-c2fb-4bfe-b1c8-17ed13c96188/78958510880.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccee0096-8e0d-4eea-b2d3-8ae531656b86/monepagonu.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/woragimudove.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/26859590194.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/91265267355.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/mahaonline_mpsc_answer_key_2019.pdfIn PDF document text
    • https://71a5d838-4e22-4830-8da1-7955ec3365f5.filesusr.com/ugd/f2f43e_ffa32097b7e94ecc878e982ded8e5734.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7baf6491-4e27-4dc4-9e85-cbed64824668/how_to_reset_a_galaxy_tablet_to_factory_settings.pdfIn macro / runtime command snippet
    • https://83bd47e3-138d-48d8-8d00-514fe13b91b0.filesusr.com/ugd/c87a2f_22c9b0dedab440e5b288f8ddbb5e0c71.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ligole/kmsauto_activator_filehippo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a65b80d6-d86c-4a41-8891-c57a3ecd9bc3/dead_until_dark_chapter_1_summary.pdfIn PDF document text
    • https://6fc76513-a17a-4053-940d-bef108f5ea85.filesusr.com/ugd/3a5ef0_4c3974f7699a42d2ad0f512ef78c9d0b.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_off0000ebef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEF 5660 bytes
SHA-256: 3eb225404786a258ff5bc444e1601465eed5c2200fbd2c8233a304e1e0da33d7
font_01_sfnt_off0000ff59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF59 10872 bytes
SHA-256: 0c418dfacd332955968f77e5b3a9827d7687bd4d04401c03a11de0b0251b358f

Open this report in the interactive analyzer, or submit your own file for analysis.