Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ccad09ca29a534…

MALICIOUS

PDF

80.5 KB Created: 2021-04-09 00:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7e903fd3caab711a5ef0a0de2557f830 SHA-1: 21b2fd6b0de9d64c699e1321c0be66f5df460d33 SHA-256: 82ccad09ca29a534bdb1b4d5ebcfa7312134a621de99736294f31ad3f1a99d1f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the nature of the link farm point towards an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/strik?utm_term=sub+zero+550+freezer+door+gasket PDF link annotation
    • https://cdn.sqhk.co/kululojilo/Bhhjdjd/5613405193.pdfIn PDF document text
    • https://vuvunovugigadi.weebly.com/uploads/1/3/0/8/130814714/8887581.pdfIn PDF document text
    • https://cdn.sqhk.co/sajatanugeg/ifQ5Bij/advertising_promotions_and_marketing_managers_jobs.pdfIn PDF document text
    • https://nadazeva.weebly.com/uploads/1/3/4/4/134499610/demobujotawuge.pdfIn PDF document text
    • http://guzolemidova.iblogger.org/based_zeus_the_godly_texting_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwosexed/fQPY0Af/freestyle_king_motorbike_freestyle_bike_stunts_videos.pdfIn PDF document text
    • https://jekotufuwin.weebly.com/uploads/1/3/1/4/131406020/mejag-kudezawolojo-jenad-fipoben.pdfIn PDF document text
    • https://cdn.sqhk.co/toromerepowa/vGiF7jf/jogobudutekabuguped.pdfIn PDF document text
    • https://cdn.sqhk.co/jegivoziba/U8Qghhj/mivemaki.pdfIn PDF document text
    • https://febasenijig.weebly.com/uploads/1/3/1/3/131379808/mutopalegiz.pdfIn PDF document text
    • https://cdn.sqhk.co/pisomuwesuk/ibTghUu/vavopujutijati.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/lodazojamuva/cpt_code_99213_fact_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jugobimuraje/what_articles_were_included_in_the_mexican_constitution_of_1917.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e74ce93-209f-4cdf-8eff-e36e86ce90b0/45736580139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09b107ea-2bde-43f9-97c2-ecf55cd87992/how_much_is_samsung_note_3_in_south_africa.pdfIn PDF document text
    • http://rewezaxow.epizy.com/xut_file_sang_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/tokigukizizidone.pdfIn PDF document text
    • http://vutakeba.epizy.com/sydney_tv_guide_tonight_free_to_air.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b91684d-d425-4a5b-822c-bd32f026ee6c/37670895888.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4c6df99-1ce8-4ebe-bf13-aec0800d3812/5943574932.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE11 5396 bytes
SHA-256: eaea55bd9d289a09dd4d0aa547048657be0f51ad4fff7556ac4c7aac7f956480
font_01_sfnt_off00010083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10083 11260 bytes
SHA-256: 1f5dadf9959c7b3b035ad3551ae19ef76b06f819ea1d5b8fd5c6ac183218e478
font_02_sfnt_off000126a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A8 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3