Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e1817462cd88d01…

MALICIOUS

PDF

74.3 KB Created: 2021-01-14 11:46:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6d106efc0e766d8627ad15aa87390cf4 SHA-1: 746eb684080d028870fc7846acf8e0c70e16fe37 SHA-256: 5e1817462cd88d01476acfe753528a2377e0436b857fb3d6f1dbb25635516ce5
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors or link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=oae+025+study+guide In PDF document text
    • https://static.s123-cdn-static.com/uploads/4446045/normal_5fcd9778e1d6e.pdfIn PDF document text
    • https://gapikedezasede.weebly.com/uploads/1/3/1/4/131438622/2715006.pdfIn PDF document text
    • https://guvoruba.weebly.com/uploads/1/3/4/7/134742814/eb3a2.pdfIn PDF document text
    • https://radutarogo.weebly.com/uploads/1/3/4/3/134379411/jewusabev_gupomo_welerogivopej_daxigomemo.pdfIn PDF document text
    • https://telozigigozato.weebly.com/uploads/1/3/4/3/134310186/adce1e.pdfIn PDF document text
    • https://cdn.sqhk.co/xafemepino/3qjuEMN/lovezuxedu.pdfIn PDF document text
    • https://lezafopiga.weebly.com/uploads/1/3/4/6/134628758/sorawifa_nireduliradu_puwab_babelorakupopa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mubefula/luzukaxesozebabigibodutiw.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/80817386681.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/iowa_high_school_football_pairings_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/bethena_a_concert_waltz.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/dokogizibobevufokuked.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_off0000d78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78B 5056 bytes
SHA-256: e9742debb2b4dd3c3f0797bc01b39a052dc785b7f23a3510e0a14f3be9230451
font_01_sfnt_off0000e8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D3 10892 bytes
SHA-256: 1fb116c54ac9f925c2ea6fb6b713624d72939a259c796cb89ce0cff2cc36b803
font_02_sfnt_off00010e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1F 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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