Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ff65f46468f793…

MALICIOUS

PDF

76.5 KB Created: 2021-05-24 20:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 51aa960f1587adeb094278f6ed5dd646 SHA-1: 17a8b9fe80d3f4faf251b5890ee492bf117e6e70 SHA-256: 61ff65f46468f793f8391568a95a3dfe61e65118fdfc9692b7451573545352a0
156 Risk Score

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. 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 0.9991

Heuristics 5

  • 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.
  • 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://golowaki.ru/strik?utm_term=ccsd+calendar+2020-21+gillette+wy PDF link annotation
    • https://regezubigif.weebly.com/uploads/1/3/5/3/135320660/7bc8ce49.pdfIn PDF document text
    • https://serirufudo.weebly.com/uploads/1/3/4/7/134712976/nijigujuxanor.pdfIn PDF document text
    • https://pajuzexakomujub.weebly.com/uploads/1/3/4/8/134898896/lunonanat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379486/normal_5fcf190edde47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374978/normal_603a8a8dde5c0.pdfIn PDF document text
    • https://vamepuruzaf.weebly.com/uploads/1/3/4/3/134352512/kopovimatilovi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470228/normal_5fdfd86f24af7.pdfIn PDF document text
    • https://tesajezu.weebly.com/uploads/1/3/1/4/131452821/bodawiwevegemunaje.pdfIn PDF document text
    • https://lutaxebibutemun.weebly.com/uploads/1/3/1/3/131380730/gajuje.pdfIn PDF document text
    • https://nukawidizuzaxep.weebly.com/uploads/1/3/3/9/133997642/675148bb450.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369168/normal_5ff3310c8855d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407756/normal_606c31e9f1caf.pdfIn PDF document text
    • https://rijevolokawuja.weebly.com/uploads/1/3/4/6/134661742/mebasobijamujujir.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/77030d4d-531e-4a0f-b000-e20795626ae1/adobe_photoshop_cs6_classroom_in_a_book_dvd.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/gastroenteritis_aguda_en_perros.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/what_is_13_reasons_why_about_season_2.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/how_to_assemble_graco_pack_n_play_travel_dome_lx.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/26735105103.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3560f1cc-5c4a-42cb-8941-b78ed0a4602f/leruludididu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fef21648-b59d-4b70-812f-57145fdea050/jevalasupaxigabuvokoze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/745a577c-0891-4cb8-aa27-926ea9ef678b/fishing_hook_knots_video.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/chrome_windows_7_64_bit_standalone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6b3445c-5a24-40c0-bd79-d50c9e3d3180/dell_xps_8500_16gb_ram.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/dragon_ball_legends_android_14.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_off0000e983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE983 5564 bytes
SHA-256: 73b162b7904eab18382c11b1bd7d90256ab1ccfeb7a83499e2f50b79c3bc3e65
font_01_sfnt_off0000fc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC94 11100 bytes
SHA-256: addad1403aa0534e9f253232673a2bcebec3a8684b9e47f3f555c9fb2c73b021