Malicious PDF — malware analysis report

Static analysis result for SHA-256 980da44ef1f91878…

MALICIOUS

PDF

79.6 KB Created: 2021-03-17 04:18:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9d1824049d57a28980645ef5c3bd92b6 SHA-1: a19a07c45c311bd544ab8273ed200fa20747534a SHA-256: 980da44ef1f918789ff41c2356087c8dde217b1bab802a18adae0141c2d16d7f
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest an attempt to redirect the user to malicious content.

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://kuzutuzo.ru/strik?utm_term=what+are+the+starbucks+reusable+cups+made+of PDF link annotation
    • http://fufejezonodim.mywebcommunity.org/how_to_hold_and_swing_a_baseball_bat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486220/normal_602dcc402d080.pdfIn PDF document text
    • http://phillipen.online/kudumikevevubibn49k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391308/normal_60045489b8832.pdfIn PDF document text
    • http://circulyarkadigital.xyz/history_of_new_york_media_careersgwtri.pdfIn PDF document text
    • http://wivuperafuzo.mypressonline.com/17431787357.pdfIn PDF document text
    • http://zetomanebegox.iblogger.org/english_grammar_articles_exercises_with_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450870/normal_601b912259518.pdfIn PDF document text
    • http://nejuwenazi.iblogger.org/48421414993.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_cf00e5a831e04d6383564ce94ba4e493.pdf?index=trueIn PDF document text
    • http://pejemevogoge.myartsonline.com/52942189140.pdfIn PDF document text
    • https://276658a2-c6b1-4a23-bc3b-56c82bce4278.filesusr.com/ugd/f9448a_ae61a5bbd8be4c2ab470fbc372e40a91.pdf?index=trueIn PDF document text
    • https://12a3aa02-022d-4218-8efb-90aa4388683d.filesusr.com/ugd/6dfd9b_3d37432d58a64aeba042c98ccd191ba9.pdf?index=trueIn PDF document text
    • https://4c80ca50-31de-4e6f-b265-471620011c4a.filesusr.com/ugd/08c6b7_89f6261a814b4c4da2170d33d678e59f.pdf?index=trueIn PDF document text
    • http://mekasesajiw.onlinewebshop.net/24429043730.pdfIn PDF document text
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_8cbddae824ef4dcca97a7ef622aec0ff.pdf?index=trueIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_8b179f792ca84c958114b3f83a350622.pdf?index=trueIn PDF document text
    • http://residarifuwus.rf.gd/lotufonozox.pdfIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_6679303e34964cac9559d321a6136414.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_off0000f672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF672 5612 bytes
SHA-256: a7e8ac701a79cd402884e305bfeb50e31e99e1e9bc4a63a4ff9c70d682318e39
font_01_sfnt_off00010967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10967 11076 bytes
SHA-256: 1a53bb4dae9dad6b318143c22634c50e08eba36fe5a3afcfb972007dcde8281a

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