Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad2f1794d166b06c…

MALICIOUS

PDF

80.6 KB Created: 2021-03-17 06:17:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 088deef75027b3b4f7d8edcf9618eff0 SHA-1: 9780cba52ccc720d4505f5b02227b45b3422a541 SHA-256: ad2f1794d166b06c9533238ed2ec02ba9ebae7731d6b1b123e13ad40719da1fe
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm on disposable hosting, containing numerous external URIs pointing to potentially malicious domains. The embedded URLs suggest an attempt to redirect users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://pelibifir.ru/award?keyword=http+appear+in+gdsonline+pdf PDF link annotation
    • http://kinoxca.xyz/884368029848n14w.pdfIn PDF document text
    • http://avlto.best/rufulutowiwusini9fdh.pdfIn PDF document text
    • http://netopodimamo.mywebcommunity.org/2132002160.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374372/normal_60075471959fa.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/ihgc3DO/tegijoterotedusadifona.pdfIn PDF document text
    • https://cdn.sqhk.co/jixuvepabu/gemUShb/kujub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388613/normal_603cf2ac706a5.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutorixo/ficNTjc/sharks_spotted_off_california_coast.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461761/normal_5ff971f64ad53.pdfIn PDF document text
    • http://centerverifybadge.com/xofetujamekexinowikek2m.pdfIn PDF document text
    • http://laluwaraselolar.mywebcommunity.org/42468534233.pdfIn PDF document text
    • http://gemofesane.medianewsonline.com/33741327014.pdfIn PDF document text
    • https://cdn.sqhk.co/todusukiraxi/hgDQ9gc/athletic_apparel_industry_market_share.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465930/normal_5ff6c227ab971.pdfIn PDF document text
    • http://zixivudu.getenjoyment.net/wititinojavel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/b53445ee-4bbf-4d2d-b8f1-4e4e1a833117/bagigofimakuwi.pdfIn PDF document text
    • https://3f46bf15-0a8c-4e80-b3e5-a2e3bf90e008.filesusr.com/ugd/8e6e76_1739961c47fa4b9abcd811b303642d51.pdf?index=trueIn PDF document text
    • https://ad843f61-c544-48d7-8cfb-3c048b9edb46.filesusr.com/ugd/0dd9ed_429d150f6d164ffda08a57744f13763a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ecc000e-c309-4c18-915e-362a8b1b9a8e/20134837161.pdfIn PDF document text
    • https://b84c3727-5d5a-4c5d-9d5d-21cac87b3a69.filesusr.com/ugd/fdd6c2_f90ba856015d4f76b6c62854858a6c2d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aedad8a5-bb7d-44bc-a1de-ce5311c072c5/6356976831.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/000505be-78a6-4f56-95e5-d3ada25125e2/5907722485.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae89cd2b-1cf4-4ecd-9284-c92488cd4b9f/11896992889.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_off0000ed9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9A 5172 bytes
SHA-256: ab3c0723d665d83116fde2cd63996ede8bb9782d42c8ec7c6d40c113018c31b9
font_01_sfnt_off0000ff41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF41 11628 bytes
SHA-256: 9f60050145419dd90b7ce03af07ec3ce455dd8a8fdf51678a7e71c20bd37c1d7
font_02_sfnt_off0001274b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274B 3252 bytes
SHA-256: d34dcfcc6e2bbbf510c29f2fabbd3ca4655d49da0e5701f1583dbd2650a53eac