Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea0f5ed5cf779319…

MALICIOUS

PDF

80.4 KB Created: 2021-03-27 21:36:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: bf4c9125bea6ca298dbffb5245041b80 SHA-1: efb2e8b859b678086ba29cfb7c1bec73e3fdc325 SHA-256: ea0f5ed5cf779319fc8dc35a3c13507cdb470fad2debb9c60be8a12536c76bf2
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://nipisod.ru/123?utm_term=investigation+report+on+3d+printer PDF link annotation
    • https://cdn.sqhk.co/fefowofuk/xjezoZB/flip_cap_water_bottle_price.pdfIn PDF document text
    • https://cdn.sqhk.co/sevijeruba/hajir1X/smart_pulse_oximeter_ichoice.pdfIn PDF document text
    • https://cdn.sqhk.co/wulozonixuf/lTge0Uo/9505906496.pdfIn PDF document text
    • https://cdn.sqhk.co/vodadavubex/9ku22By/23924807037.pdfIn PDF document text
    • http://qupieasy.online/zisumum27z23.pdfIn PDF document text
    • https://volufijipezuji.weebly.com/uploads/1/3/4/7/134703795/1424188.pdfIn PDF document text
    • https://cdn.sqhk.co/wofetewa/64YMhhh/41665790865.pdfIn PDF document text
    • http://biotringel.shop/the_wheel_of_time_tv_series_redditp5luj.pdfIn PDF document text
    • https://divoguwobumiwes.weebly.com/uploads/1/3/4/4/134487338/9306939.pdfIn PDF document text
    • https://pafodezeba.weebly.com/uploads/1/3/4/5/134589846/vobuge.pdfIn PDF document text
    • https://bimevaxufozuz.weebly.com/uploads/1/3/2/6/132683359/57dc6eb3.pdfIn PDF document text
    • http://xviiivbgz.com/932136887533tt18.pdfIn PDF document text
    • https://ripumoravoramex.weebly.com/uploads/1/3/1/6/131606135/zugesitajigasu_zijojija_rogovewi_fidufum.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/4cf4c884-c589-47b1-8b4d-a877c0add0e1/cuisinart_k_cup_coffee_maker_descaling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8bd534b-be8a-4a3f-b100-4b1329fe610c/the_dilbert_principle_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7292f7f-ec5c-4f49-af73-e2a49ad0235f/64622519459.pdfIn PDF document text
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_5336f1e4a43e42ed9ec5f4c57dcb89d1.pdf?index=trueIn PDF document text
    • https://a4078cf6-8fa3-420b-ab61-258487076e43.filesusr.com/ugd/a3907e_b7fe99efa0434182a520179c6856f1e3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b178768-6957-47d1-ab56-f22efcc40795/dyson_owner_login.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4497fe6f-4efe-4f44-b6ae-aeeebae77aa4/spectrum_cable_tv_ref_code_s0900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c75cbda-57e4-47cf-b895-7a28746ef7e2/52810954220.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21528c95-2566-463e-b315-346341eade88/govesunoduwujatajul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00992281-df3f-420e-9981-d30e284d23d7/75411495405.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_off0000fd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD78 5256 bytes
SHA-256: 937bb6d0b4e0b568d6c695821ee2d34e01a8fc02b5a1f94ba6bdf1eb1c39ce7b
font_01_sfnt_off00010f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F71 10772 bytes
SHA-256: 5f1b7cd344f4a040bbd733bea871b255e927853afa91d55a42cce8a5c0d49f9e