Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b1de79121a1c1af…

MALICIOUS

PDF

72.0 KB Created: 2021-02-24 10:52:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: e8ebda7edc35fb3d3aff6bdea1447b94 SHA-1: e08548b3a38eb6df180303bb007c0ff26baa0812 SHA-256: 3b1de79121a1c1affe7f99d7e017bb92dd4de1291c15dd607be4cd6a5586043f
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and redirectors, indicating a link farm designed to manipulate search engine results or direct users to malicious sites. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure. While no scripts were extracted, the structure and embedded URLs strongly suggest a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • 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.
  • 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=most+dangerous+street+new+york+city In PDF document text
    • https://lojopozubog.weebly.com/uploads/1/3/1/6/131606756/subemapimi.pdfIn PDF document text
    • https://niregesop.weebly.com/uploads/1/3/0/7/130776037/1226467.pdfIn PDF document text
    • https://pejedakava.weebly.com/uploads/1/3/1/4/131453393/jukexubusokiwi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380536/normal_6025ea6340207.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473056/normal_5feafa50aa0b1.pdfIn PDF document text
    • https://cdn.sqhk.co/satidaruxami/cHgcDwL/13117390278.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386092/normal_5fd355e766d34.pdfIn PDF document text
    • https://furadigiwib.weebly.com/uploads/1/3/1/4/131407367/b8049e49.pdfIn PDF document text
    • https://vedakevuvapi.weebly.com/uploads/1/3/4/0/134013486/df9febc3a4568.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465003/normal_5fdde92c475e2.pdfIn PDF document text
    • http://pubgmobiie.com/what_is_the_environmental_ethicsdnifz.pdfIn PDF document text
    • http://storeeuro.info/28171726449to3pp.pdfIn PDF document text
    • https://cdn.sqhk.co/nivipanevi/jiwjj5m/84790837382.pdfIn PDF document text
    • https://raguwamirib.weebly.com/uploads/1/3/4/6/134630778/df4caf22b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465930/normal_5fd97392ecde5.pdfIn PDF document text
    • https://vaputonusodi.weebly.com/uploads/1/3/4/4/134493057/fiwabome_pefozos_detixinalu_mosagibewe.pdfIn PDF document text
    • https://cdn.sqhk.co/giboxikewev/nnicfhb/76962637200.pdfIn PDF document text
    • http://kernig.pro/planes_controlados_telceljc492.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/pozokimepe/janapada_song_video_kannada.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/angry_birds_transformers_codes_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/ben_10_alien_force_game_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/edexcel_a_level_geography_textbook_answers.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_off0000da6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6D 5336 bytes
SHA-256: 5347aae2cbbe400439adf898efea115aa99f38832e40876e8b787e28002c26a9
font_01_sfnt_off0000eccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCC 10988 bytes
SHA-256: dd3536d1854d5331862ef070e5d43300b4135ce06a8e085548c6473e7413e7f9