Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f3509666413963…

MALICIOUS

PDF

71.3 KB Created: 2021-02-14 10:41:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6d0726c15c55ffdc9838f35eae7dc09f SHA-1: 4848660f3f1f26e907b5f5159f76b3a66e13bbd5 SHA-256: 15f350966641396310bff6276937e6e33d0c5551b41bee0b7de2ddc67b8f68d4
156 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm and has been flagged as malicious by ML classifiers and ClamAV. It embeds external URIs, including one that appears to be a search result lure, and a large number of links to other PDFs, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the presence of embedded URIs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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=high+school+story+ring+hack PDF link annotation
    • http://mishgen.com/suvewomizeroo8i50.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487184/normal_5fc7457c2a864.pdfIn PDF document text
    • https://dulewidojupetor.weebly.com/uploads/1/3/2/6/132695372/varajuzora_fulifojotaf.pdfIn PDF document text
    • http://makamar.online/238288875158fu6f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444646/normal_5fe51ad31cdba.pdfIn PDF document text
    • http://shopsmmv.site/mudalinirre17l.pdfIn PDF document text
    • https://vonepegoparopew.weebly.com/uploads/1/3/4/3/134352316/9442560.pdfIn PDF document text
    • https://nidikibadut.weebly.com/uploads/1/3/1/4/131453007/6514000.pdfIn PDF document text
    • http://albl.ru/vinexo1qq3r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368477/normal_60010468accf6.pdfIn PDF document text
    • http://animoney.xyz/payday_2_election_day_truck_guide52343.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423166/normal_5fe9ce5c19343.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/futamo/24584528920.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/cnco_pretend_live_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/65974066034.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/baseline_risk_assessment_template_excel_south_africa.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/grapplers_guide_code.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_off0000d643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD643 5188 bytes
SHA-256: 22f5edf6e8c44e505ee9c12b21eaf012cee95ad43416a4fdada5768d333bf15c
font_01_sfnt_off0000e7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F1 12356 bytes
SHA-256: 6548fa13b765cd1e1237b6a0248e34485a37dbdacd6231dea6fe5aaab5a32ebd

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