Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeee18780a15fe5a…

MALICIOUS

PDF

75.1 KB Created: 2021-06-10 02:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 344e31d557f4436cc39d3ae093e0292b SHA-1: ca827aa8e860f429f90e8bf7bf0a83725988f51f SHA-256: eeee18780a15fe5a57615fbaa0f73508287528636888fcdb4b9192291e468dd7
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to distribute or phish via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • 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://krisoc.ru/pbw?utm_term=all+i+want+for+christmas+is+you+to+go+away PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446399/normal_5ff76622792a0.pdfIn PDF document text
    • https://xedukigujidazan.weebly.com/uploads/1/3/4/5/134512451/nesarebojovipeja.pdfIn PDF document text
    • https://tofeniva.weebly.com/uploads/1/3/4/6/134625175/wizafefuxulazofak.pdfIn PDF document text
    • https://fejovixojik.weebly.com/uploads/1/3/4/3/134333762/7639040.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486548/normal_60135adee9f0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409818/normal_60b89fcf73f59.pdfIn PDF document text
    • https://didaripetog.weebly.com/uploads/1/3/4/6/134685212/3713996.pdfIn PDF document text
    • https://sanivuledaxefe.weebly.com/uploads/1/3/4/2/134234591/f3b414.pdfIn PDF document text
    • https://lonawojalokofa.weebly.com/uploads/1/3/1/3/131382346/dixekum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460477/normal_604a1b2c6c085.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wimarolos.pbworks.com/w/file/fetch/144509415/verint_impact_360_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d31cd2d7-827d-4edf-87a6-4795975b29d7/how_to_test_reading_fluency.pdfIn PDF document text
    • http://tubekikewabi.pbworks.com/f/tryst_with_destiny_objective_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45fb5693-bfe6-406a-9d72-95147d6151ac/niveles_normales_de_ferritina_en_covid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e545559-860d-4e37-bbef-376394b25d0a/huawei_hg635_firmware_update.pdfIn PDF document text
    • http://nugewil.pbworks.com/f/34940559367.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71f7b7ca-594a-4e5e-bafa-b95d01fbc4cc/37149764202.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7962521e-5d04-4f8b-b8c6-7aa410112731/49524745317.pdfIn PDF document text
    • http://mapaduzipi.pbworks.com/w/file/fetch/144506421/balazafu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/903feab8-8d63-4dc8-b4bc-10344f3f9224/36239240762.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e589615-0cf4-4f49-8f31-f5ccb6d9b5b0/graco_pack_and_play_changing_table_pad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53dbf822-9dbf-4ec5-af8c-c4de33217049/98342317851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04df3bf0-9922-440c-b302-c0d38303443d/books_of_the_bible_old_testament_funny_song.pdfIn PDF document text
    • http://vogituvu.pbworks.com/w/file/fetch/144980163/download_windows_10_highly_compressed_in_10mb_iso_file.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e60df093-6e2a-4279-adfd-bb9440638cdd/muroraki.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_off0000e415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE415 5476 bytes
SHA-256: eff45cabb8ddf40122de915447b1e30fd05c9d1236f04058df809a079c312769
font_01_sfnt_off0000f6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AB 11900 bytes
SHA-256: cdebc2d7638656fc5020e8e61f1f028373a02382f09eab9ec74ebf0847d7ddf0