Malicious PDF — malware analysis report

Static analysis result for SHA-256 c380c8b3665e6969…

MALICIOUS

PDF

73.3 KB Created: 2021-02-28 02:14:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: b1001ef6f5961ece9ccbbac80504d2a7 SHA-1: 7b66e8ec0a0e25854dc292d767cd7b2d2388c119 SHA-256: c380c8b3665e6969b16778b4ae893f2ec47798a523f66919dcc7408ec76a161a
192 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically indicating it functions as a redirector to malicious infrastructure. The presence of numerous links, many pointing to disposable domains and employing SEO-related terms in their URLs, suggests an attempt to lure users through search engines. The ClamAV detection further confirms its malicious nature, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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/strik?utm_term=subway+surfers+hile+apk+indir+android+oyun+club In PDF document text
    • http://rijewomel.scienceontheweb.net/90082962854.pdfIn PDF document text
    • http://dirtygirl.fun/90070177666b146u.pdfIn PDF document text
    • https://cdn.sqhk.co/mojuzizimu/nnVlghD/screen_recorder_android_apps_top.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/tekovot.pdfIn PDF document text
    • http://hardcreditcheck.info/telazupt4xgz.pdfIn PDF document text
    • https://cdn.sqhk.co/xederebat/hgdp9jj/tikedonot.pdfIn PDF document text
    • http://price-list.moscow/691483557861pbt6.pdfIn PDF document text
    • https://cdn.sqhk.co/sozaxejiv/eUhdhhN/nidiwatoxixukilekoze.pdfIn PDF document text
    • http://midikakuvekume.mywebcommunity.org/why_is_my_roomba_not_connecting_to_wifi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448547/normal_5fee2911ab83f.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/niveles_de_prevencion_salud.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/jimugivos/free_printable_metaphor_and_simile_worksheets.pdfIn PDF document text
    • http://tunowik.epizy.com/sunubumuk.pdfIn PDF document text
    • http://jonuvavito.epizy.com/lodefawarid.pdfIn PDF document text
    • http://fubavinexazixo.onlinewebshop.net/mizawogilevaw.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_off0000e243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE243 5744 bytes
SHA-256: e63256419cc40a7ae1bd3578411971db2deeff0ba7ec324499714cd216975ad6
font_01_sfnt_off0000f5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E3 10120 bytes
SHA-256: 738ab9747bcae6a76d55125b9c15acc31a9d5f15892210d2c19f8cc1739bc370

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