Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c933c7bf70a351e…

MALICIOUS

PDF

74.3 KB Created: 2021-01-21 12:05:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: b14d93c1618791232101009f1d0d84a7 SHA-1: 7f3bdc57807a12c05de66cc565dc7f249ef46996 SHA-256: 7c933c7bf70a351e8d7747d70e4095e7669bb301bc2052676677a951799184aa
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 hosted on disposable domains, indicating a link farm or redirection scheme. ML classification and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/aws?utm_term=capsim+situation+analysis+answers+2017 PDF link annotation
    • https://cdn.sqhk.co/rifebonapesi/hH8jdif/todd_rundgren_wife_pics.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447877/normal_5ff26ee41de64.pdfIn PDF document text
    • https://gilepinewuje.weebly.com/uploads/1/3/4/0/134096317/8349990.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/jjcqPgj/russian_classic_car_simulator_oyunu_oyna.pdfIn PDF document text
    • https://funavekun.weebly.com/uploads/1/3/0/9/130969801/xurija_vebekufuperamaw.pdfIn PDF document text
    • https://cdn.sqhk.co/movumatoz/Aie1pie/sebixepomarulad.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/0hgjjVK/82676594950.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412174/normal_5fe829e9a9394.pdfIn PDF document text
    • https://cdn.sqhk.co/doxinotilid/Xjalgjg/e_wallet_login_problem.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/QhoiaCU/prop_hunt_code_fortnite_farm.pdfIn PDF document text
    • https://site-1175696.mozfiles.com/files/1175696/masterchef_yeni_bolum_fragman.pdfIn PDF document text
    • https://vipefujalebir.weebly.com/uploads/1/3/4/7/134744486/tegorekaruwefatowo.pdfIn PDF document text
    • https://sewurinibe.weebly.com/uploads/1/3/4/5/134595705/favuvezi_podaniwata_wufonexudetavu_fetipal.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/hBjgthg/kegevovebap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454289/normal_5fe91d0f2d796.pdfIn PDF document text
    • https://cdn.sqhk.co/berirenike/0ghhjaP/ps_vita_fighting_games.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443326/normal_5fcce7064c313.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/remufuzu/vuwupo.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/honeywell_security_system_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/wojajiwaje.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/karvy_mutual_fund_service_request_form.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_off0000e21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21F 5468 bytes
SHA-256: f2892876e08afdf93e8e86b64341f462eb262e054eef9f39e508e5d3cc229fa9
font_01_sfnt_off0000f4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BF 11540 bytes
SHA-256: 736c09dc7ed20f2c98bb087153b0a680c62ef7131f769da71f2f3b6d761fd0b1