Malicious PDF — malware analysis report

Static analysis result for SHA-256 424cba6b8f637781…

MALICIOUS

PDF

75.9 KB Created: 2021-02-19 20:46:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 732ee62d1e0d1bfad612feafa819bf93 SHA-1: a06adbcb8ce5e315df7124d7e4ecbfa8196ce0fa SHA-256: 424cba6b8f637781252beb56a17258047a932c1dd6313c00c040de9fde7a9e48
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely involving the redirection of users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wix?keyword=kill+clip+vs+rampage PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477164/normal_600c8e9c2efac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488323/normal_6021013758f64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455180/normal_5fedc39aca91d.pdfIn PDF document text
    • https://lefiluke.weebly.com/uploads/1/3/4/8/134887161/fuxax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488092/normal_5ff32e30cc583.pdfIn PDF document text
    • https://radutarogo.weebly.com/uploads/1/3/4/3/134379411/mulasakoxajuxatagil.pdfIn PDF document text
    • https://feroredo.weebly.com/uploads/1/3/1/3/131379294/niwudaxevuru.pdfIn PDF document text
    • https://josugutidilem.weebly.com/uploads/1/3/5/3/135387313/niwobotedubaf_jiledub_webabufibum_doxopujepowevor.pdfIn PDF document text
    • http://masterpowerpoint.com/ritevegetoriwnu2k.pdfIn PDF document text
    • http://requiredjokblog.com/funniest_nsfw_memesgzllo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365608/normal_5fe0b953e0bf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416940/normal_602e6ed00db7b.pdfIn PDF document text
    • https://liwitozawaben.weebly.com/uploads/1/3/4/0/134042828/3803929.pdfIn PDF document text
    • https://masagefila.weebly.com/uploads/1/3/4/5/134505888/7f74b9ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377381/normal_5fce8ce755b63.pdfIn PDF document text
    • http://robinmani.site/dji_tello_controller_manualo2a92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443354/normal_60109ef68b6fa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vedisupekak.epizy.com/sand_balls_game_for_pc.pdfIn PDF document text
    • http://xiwilamudebi.rf.gd/sulabozowaloj.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_off0000ec9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9D 5280 bytes
SHA-256: ada849602b65bc76c22bbf30f441722a7e9334ae1e525d555a1b7c33fbb06016
font_01_sfnt_off0000fe8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8E 10412 bytes
SHA-256: 185f9c457b2c1786875524dffd88e3c0f797218ba693410ae3debbcaebd9a2dd

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