Malicious PDF — malware analysis report

Static analysis result for SHA-256 616404bd506aa560…

MALICIOUS

PDF

175.7 KB Created: 2021-02-18 06:52:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: eb2aac632cf6c2fbf1bfc700538cf1f6 SHA-1: cc8d84c75e292ea92c4eb847aad26c9be83e32d0 SHA-256: 616404bd506aa5607c2c8feba799fe122e2d33772ab6053125af892060feb2a5
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/strik?utm_term=misery+stephen+king+book+ending'. This, combined with ML classification and ClamAV detection, strongly indicates malicious intent. The document body, though heavily obfuscated, contains text fragments that, along with the heuristic 'SE_URGENCY_LURE', suggest a phishing or social engineering pretext. The embedded URLs are likely used to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=misery+stephen+king+book+ending In PDF document text
    • https://cdn.sqhk.co/baxotonad/ijhdgd1/lusobusiluwitupikuxato.pdfIn PDF document text
    • http://podarokinsta.site/xezobigawab5fv1k.pdfIn PDF document text
    • http://sovetnik53.ru/who_s_your_guy_lyrics_dremo69hzm.pdfIn PDF document text
    • http://meetlait.pro/420268860384mzwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421787/normal_602ac1d8a4944.pdfIn PDF document text
    • http://abzac.me/vnc_server_for_rhel_68410h.pdfIn PDF document text
    • http://naturapple.space/82056468109ohdbh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417653/normal_5fe0d67d5c20d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409244/normal_5fd60df3cdbf2.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/hbgexgi/lords_of_aswick_mod_apk_download.pdfIn PDF document text
    • http://true-board1.club/80566654395sxsli.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/e8ygWib/notes_in_spanish_podcast_1.pdfIn PDF document text
    • https://cdn.sqhk.co/fagevibe/n3geohb/new_espn_chicago_radio_lineup_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382961/normal_60087197625ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409000/normal_601d5790b7907.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/gagagakigibapo/state_of_tennessee_incident_reporting_system.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/19514157411.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/appcleaner_for_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/filmorago_free_video_editor_pro_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/canadian_pediatric_society_asthma_guidelines.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_off00027218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27218 5288 bytes
SHA-256: 92dae28dfe1b357d4141e17f471470c5528690af77253052cfbfd5df3abda022
font_01_sfnt_off0002841f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2841F 14696 bytes
SHA-256: a6c559c2fef4ff0378ba305e7e038a59c1afe12aa663777ad7f9db9c398f4dd8

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