Malicious PDF — malware analysis report

Static analysis result for SHA-256 962145cf9c604c0c…

MALICIOUS

PDF

89.1 KB Created: 2021-02-23 14:57:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a53f658ab4a36d869240d875ed3cdc90 SHA-1: 5c17803101950db51d1af045c8539461d1769ac4 SHA-256: 962145cf9c604c0cec8ac3de234099976f02ca1fafc64f2725be53eca0894726
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, suggesting a link farm designed to distribute malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to deliver secondary payloads or redirect users to malicious sites.

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://jottigo.ru/123?utm_term=how+to+repair+water+pump+leak PDF link annotation
    • https://cdn.sqhk.co/puvegipuros/jpjihjt/69407519147.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/AVfiahb/grand_alliance_order_book.pdfIn PDF document text
    • http://es50off.pro/mezugimefmwr6g.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxabofapuw/5Rgcifn/forulaful.pdfIn PDF document text
    • http://setlyb.online/188625851561sls6.pdfIn PDF document text
    • https://tafibukazun.weebly.com/uploads/1/3/5/4/135400045/pisovosafa.pdfIn PDF document text
    • http://twoup-viktoria.online/35166764293s55v3.pdfIn PDF document text
    • https://cdn.sqhk.co/vigomuraguf/egfRDjj/automatic_school_bell_timer_circuit_diagram.pdfIn PDF document text
    • http://jadebey-x.com/bosch_obd_1100_live_data3hg0r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jawolaguf.rf.gd/911138461.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/76620319456.pdfIn PDF document text
    • http://tedizixulore.epizy.com/74794489741.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/driver_booster_6._2_crackeado.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/ashraful_hidaya_english.pdfIn PDF document text
    • http://pegewolonu.rf.gd/aan_carotid_stenosis_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/mitelovaxid.pdfIn PDF document text
    • http://jevusavisa.epizy.com/le_libralisme_politique.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_off00011ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCB 4904 bytes
SHA-256: 8b744b7fcd60bc74db2b6be1bce24df7890273f2c21f86945cf4af455f64c7e5
font_01_sfnt_off00012d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6C 11764 bytes
SHA-256: c6e2c104b271e944ea760b3c5bcbd74224685e39c62492a606e9cc9e2b127ca0

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