Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb7eea8932a5787…

MALICIOUS

PDF

81.4 KB Created: 2021-03-27 15:15:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 25149a780602fed0005bd3d2ceb6fce6 SHA-1: c29cbe5eb31c26234066e1731b30e40fca2ec3e2 SHA-256: 4eb7eea8932a57875fa0881cd5aa1b9fe8af41949b196ca9c2fa85939e4c4bcb
194 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The presence of a 'download' button lure further supports a malicious intent to trick users into downloading unknown content. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dugedepap.ru/123?utm_term=burnaware+free+portable PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387815/normal_600e930e773c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412164/normal_603bb2ec40b7c.pdfIn PDF document text
    • https://joposiga.weebly.com/uploads/1/3/5/3/135399072/duwagir.pdfIn PDF document text
    • https://pelozaxuji.weebly.com/uploads/1/3/2/6/132680784/8298385.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450419/normal_600a57a9dd041.pdfIn PDF document text
    • http://tasunixupowife.66ghz.com/printable_blank_head_sheets_for_hairdressing.pdfIn PDF document text
    • https://rezikixudagip.weebly.com/uploads/1/3/4/7/134746502/d11218.pdfIn PDF document text
    • https://cdn.sqhk.co/zinumazak/i8Oigpl/kpop_girl_groups.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496391/normal_5fe42fc394bea.pdfIn PDF document text
    • http://wegafanu.iblogger.org/graphic_design_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/jukowejazus/YUXyZif/moxanufexo.pdfIn PDF document text
    • https://banezinalirunod.weebly.com/uploads/1/3/1/4/131437453/619afcba4c39b.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwetebep/fyVyi2P/first_strike_compact_fsc_paintball_pistol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495055/normal_600b6690b2103.pdfIn PDF document text
    • https://cdn.sqhk.co/fozozumaj/ghKE3Sg/44011532839.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://aece7fbc-7072-4055-9cfa-29e0da41b620.filesusr.com/ugd/e878fd_6877a5e3950f44f18f135cc35676e951.pdf?index=trueIn PDF document text
    • http://betesemimototi.rf.gd/ketiremotadepu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8d28dff-27a0-45a2-b7c2-5a26be6bc651/hey_black_child_poem_original_author.pdfIn PDF document text
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_335e3b48b4bb4e42b86d91519913b3e8.pdf?index=trueIn PDF document text
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_a2e5a23f99f7462cb85924438b1d7b28.pdf?index=trueIn PDF document text
    • http://zolorame.rf.gd/tararefes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01af1de2-26f5-4827-8c1b-1e10865838aa/republic_of_doyle_season_7.pdfIn PDF document text
    • http://bunakakivukutus.epizy.com/8619526686.pdfIn PDF document text
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_e58e2251b4ea48858909de12c8d20860.pdf?index=trueIn PDF document text
    • https://3a5aa097-47f9-475f-9992-83bceef25cc3.filesusr.com/ugd/f55bec_9d40e34ea70b4d21a45d76981ff0e905.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
    • 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_off0000ebb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB7 4996 bytes
SHA-256: 3572ff94cef37be84d81fa238533c19f87ef2b7c30672ce1ace3b30a7387233e
font_01_sfnt_off0000fcd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD8 11688 bytes
SHA-256: c369e38cf8975fb3a1c6395a4f93a436fd8b303174125a3e8d8cf744bf55fd32
font_02_sfnt_off00012312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12312 16140 bytes
SHA-256: 3f83bbfb2e03141a9083badfb1da6e2b1773f9aa6b1ed8f30fc2d392a5ee3553