Malicious PDF — malware analysis report

Static analysis result for SHA-256 5851a8d896baafc3…

MALICIOUS

PDF

73.2 KB Created: 2021-02-19 07:37:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 34c7c0ad3f23a562eb4d618dcfe70243 SHA-1: 4063f4d244f198692d64f086b4365b4789ae6684 SHA-256: 5851a8d896baafc3b954c9184d58a60124a0c13db88ba9639f0c320dd825b20e
192 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://yafferge.ru/wix?keyword=rolling+sky+mod+apk'. The presence of a 'download button' lure and the ML classifier's high confidence score further support a malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/wix?keyword=rolling+sky+mod+apk In PDF document text
    • https://static.s123-cdn-static.com/uploads/4459057/normal_600481f5e757d.pdfIn PDF document text
    • http://scarcebook.com/zitefujotazomebawad5jinv.pdfIn PDF document text
    • http://sibivelemeruzu.iblogger.org/basic_anatomical_terminology.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373008/normal_5ffd69b2bf340.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409621/normal_5feb24b250c19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499636/normal_6017a5432b74f.pdfIn PDF document text
    • http://topsale.pro/valiant_hearts_the_great_war_walkthrough_chapter_3h91jo.pdfIn PDF document text
    • http://itgermany.net/resize_using_adobe_acrobat_prodtv3m.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/niporofez/nogijemozofavu.pdfIn PDF document text
    • http://fupuvafibip.rf.gd/67889804613.pdfIn PDF document text
    • http://xovanesoku.epizy.com/polaroid_sun_600_lms_year.pdfIn PDF document text
    • http://fuvovidesom.epizy.com/mandatory_reporting_laws_alabama.pdfIn PDF document text
    • http://pepuzigupa.epizy.com/kamexidopomujaro.pdfIn PDF document text
    • http://fexinitakemalu.epizy.com/gogoribeletuta.pdfIn PDF document text
    • http://bezegorev.epizy.com/avolites_titan_11._1_manual.pdfIn PDF document text
    • http://bipitor.epizy.com/phone_ringtone_new_2019.pdfIn PDF document text
    • http://kipixuge.epizy.com/fokunupedixeju.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_off0000d5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A1 4944 bytes
SHA-256: ad9ef6bed93d99e654be903470d91ac17cb85aaa02e81d3d5e8d9d840f5aff9c
font_01_sfnt_off0000e65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65D 10364 bytes
SHA-256: 7e96c2bf55cb3cb5443c3671fe04a75dd8c9caddfc895c32f7822ecf987e6f60
font_02_sfnt_off000109e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E4 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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