Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5e6273c523c035…

MALICIOUS

PDF

73.5 KB Created: 2021-02-18 08:08:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8863b5ae081556034219bf569a7a7f54 SHA-1: 496130e063216a30af201d1f1edc6d646c320145 SHA-256: ff5e6273c523c035046210585cf71a51cd231e9b9e9d93e728d16dd51a53dba4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one URL pointing to a malicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document is designed to redirect users to potentially harmful content or phishing sites.

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://jottigo.ru/wix?keyword=monster+led+light+strip PDF link annotation
    • https://cdn.sqhk.co/fapiwejagiz/AjdBivR/kumopakawegijepuzidakavum.pdfIn PDF document text
    • https://zabojipenow.weebly.com/uploads/1/3/1/6/131636987/75f7baa61c3.pdfIn PDF document text
    • https://cdn.sqhk.co/wesaduleb/d2Lgrjj/lopox.pdfIn PDF document text
    • https://cdn.sqhk.co/jagibuvat/blhangg/evelyn_music_90_day_fiance.pdfIn PDF document text
    • https://cdn.sqhk.co/murafabu/Fvjg2je/woxij.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/gKfPEjj/summer_pockets_switch_english.pdfIn PDF document text
    • https://lujegasot.weebly.com/uploads/1/3/0/9/130969173/de8d70a8ac.pdfIn PDF document text
    • https://mokoluwi.weebly.com/uploads/1/3/4/5/134595511/katasala.pdfIn PDF document text
    • https://serofijukepaba.weebly.com/uploads/1/3/4/6/134693026/wemor.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/jeihsz5/tokekifororofidat.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/jhjggop/woletewu.pdfIn PDF document text
    • https://cdn.sqhk.co/refevebux/egjGeZT/assistant_director_of_admissions_salary_ct.pdfIn PDF document text
    • https://jurivulanikep.weebly.com/uploads/1/3/4/5/134525456/zukepup-kadozud-xuwepufixoru.pdfIn PDF document text
    • https://cdn.sqhk.co/nusideja/jhjhije/pba_d-_league_tv_coverage.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/remeranexe/progress_report_card.pdfIn PDF document text
    • https://s3.amazonaws.com/zubata/73519301062.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/tusarulebek.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/number_theory_burton.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_off0000e38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38D 5016 bytes
SHA-256: 800f5ddd06bb68456eba5d10674f8364c869f0f890e6eb8a4018fa8a01a17452
font_01_sfnt_off0000f49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49B 10548 bytes
SHA-256: 7a538c5b9f1c5535df46975fe12c4e4c969cca10013af1635e700843436a93f0

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