Malicious PDF — malware analysis report

Static analysis result for SHA-256 63277cb43eef2519…

MALICIOUS

PDF

77.6 KB Created: 2021-03-19 03:45:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7dc38b3b5a81db89af3773e7982ac207 SHA-1: 9f7625c06ca674a6f3132549a075614c98c245a0 SHA-256: 63277cb43eef2519f331f440abe7da19bbd5b30b07dedd29cbc355037d9a4d7f
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it's part of a link farm or SEO spam operation. The embedded URLs likely lead to phishing sites or further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://botokaw.ru/strik?utm_term=irobot+roomba+black+friday+2020+deals PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450036/normal_6030ebd96bc9d.pdfIn PDF document text
    • https://torovuzexas.weebly.com/uploads/1/3/2/7/132710592/17f3569e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403130/normal_601f62983ab93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460076/normal_60508b76c5739.pdfIn PDF document text
    • https://mulanazujejuxu.weebly.com/uploads/1/3/4/8/134855463/gemegasoda.pdfIn PDF document text
    • http://gutufozif.iblogger.org/advantages_and_disadvantages_of_internet_mobile_phones_social_networking_wikipedia.pdfIn PDF document text
    • https://cdn.sqhk.co/sezelijimofi/ijeiif1/vowazujirivifosufidejawe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372360/normal_6039641de92f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407576/normal_5fe1e9523537c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418170/normal_603f166bedd14.pdfIn PDF document text
    • https://cdn.sqhk.co/dojagomudek/geihsPZ/animal_jam_jogo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454541/normal_603ff2499e0a4.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/aHjeghZ/tamil_ringtones_2019_download_masstamilan_mp3.pdfIn PDF document text
    • https://cdn.sqhk.co/bimerolu/heFigdr/love_nikki_dress_up_queen_cheat_codes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448124/normal_5fdc4d3369b77.pdfIn PDF document text
    • https://gekuraneg.weebly.com/uploads/1/3/1/6/131637503/laguradafesutuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478134/normal_601d7929c996e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417141/normal_5fd6a76395f7a.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/egdkHia/ritesusamitixorag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_bb700010f05e4d02b0e71dbdbd141616.pdf?index=trueIn PDF document text
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_c3a6789383d748678fd6bd5e5924280d.pdf?index=trueIn PDF document text
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_2b2d4fc7238f4003b602d3eba084e0cf.pdf?index=trueIn PDF document text
    • http://zejowupifodoj.rf.gd/podesepigenixulanisixidol.pdfIn PDF document text
    • https://e9593579-f51f-4dc6-af55-2543ab512b45.filesusr.com/ugd/37952c_c258f08017c84d3faf1b7605321a446c.pdf?index=trueIn PDF document text
    • http://fesenobonirizu.epizy.com/android_tv_box_apps_to_watch_movies.pdfIn PDF document text
    • http://nawatelobuj.rf.gd/cotton_single_bedsheet_with_pillow_cover.pdfIn PDF document text
    • https://6b52f5a6-db44-4d3e-8337-ab33c729cb13.filesusr.com/ugd/f4de5e_fa9736493a944a35862354a5dd3e594d.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_off0000ed5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5D 5684 bytes
SHA-256: 25686471534ad4cc001ca122b43be3f4d6f3ce298a0543fa26bc68f51a894f58
font_01_sfnt_off0001009f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009F 11688 bytes
SHA-256: 10210e2f9e8c5c57e76f4cc09647c00551e7cf6838f8950632cbd223092eb6b5