Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b270d3a7cbbf60…

MALICIOUS

PDF

80.1 KB Created: 2021-03-01 09:09:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 129edf2519711568b77aea7e7caefa81 SHA-1: 7b1bcb0d013d4680fbd91b8fc45f5959827367b6 SHA-256: f5b270d3a7cbbf6048524396401dd8ac5b9e0fa8eb5062b70303936bb459a33f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. While no scripts were explicitly extracted, the nature of the embedded links and the heuristics point towards an attempt to redirect users to malicious or deceptive websites.

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://kuzutuzo.ru/aws?utm_term=canciones+de+guitarra+para+principiantes+sin+acordes PDF link annotation
    • https://vojumemij.weebly.com/uploads/1/3/4/4/134473557/8461192.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470985/normal_5ff91f36d461f.pdfIn PDF document text
    • https://wofovadorobonam.weebly.com/uploads/1/3/0/7/130739883/1348379.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368235/normal_60082b85e2bec.pdfIn PDF document text
    • https://silepokow.weebly.com/uploads/1/3/4/3/134366863/gidavosumu-xazavuvato.pdfIn PDF document text
    • https://zatitobeme.weebly.com/uploads/1/3/4/0/134097178/7945184.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477138/normal_5fecf6943d00a.pdfIn PDF document text
    • http://parrrtner.xyz/apa_citation_format_for_research_articleq4b4h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454965/normal_60065dc6d9ac0.pdfIn PDF document text
    • https://pukadove.weebly.com/uploads/1/3/4/6/134694451/babcb49642dec.pdfIn PDF document text
    • http://duwadomet.22web.org/19662511418.pdfIn PDF document text
    • https://vozuviwugil.weebly.com/uploads/1/3/2/6/132681927/1097712.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/jumedemimo/android_studio_install_adb.pdfIn PDF document text
    • http://dezologukow.rf.gd/24255733030.pdfIn PDF document text
    • http://nakepusejedub.epizy.com/coursera_robotics_perception_quiz_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/infectious_diarrhea_guidelines_philippines.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/gupudikopote.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/cute_se_wallpaper.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_off0000ef74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF74 5116 bytes
SHA-256: 66d01e8b052d774c16c1803b99c8e0b2460126cc81d02c3ee6eb3ae7df99cebd
font_01_sfnt_off000100dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DC 1888 bytes
SHA-256: ac14972b7b2947834c866a693307dd83921f9e40fad0e2ab592cecd13463aa54
font_02_sfnt_off000109ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EF 12304 bytes
SHA-256: 472dba27d796746d47767938c484b7d56b3b42998af6eb1f5c7e32ecfb1779e4

Open this report in the interactive analyzer, or submit your own file for analysis.