Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5937cc4081ce2d2…

MALICIOUS

PDF

118.3 KB Created: 2021-02-26 01:34:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e5e07f3170922ee6e270e54fa055dc4e SHA-1: 9197cac00637a18620d8971e642c54271d92dd89 SHA-256: a5937cc4081ce2d23e8c0f4d0bc24e9c8ed30dce1ce627e8e1cc7a9093e0f5c0
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, indicating it was likely generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://jacksth.ru/123?utm_term=how+long+to+fall+asleep+with+melatonin PDF link annotation
    • https://pitatulepuz.weebly.com/uploads/1/3/2/3/132303378/korizarivoz.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/reading_scales_worksheets_year_4_australia.pdfIn PDF document text
    • https://lijepaxo.weebly.com/uploads/1/3/5/3/135324298/xodukifazub-tuzekuxu-nuvawamazi.pdfIn PDF document text
    • https://tefegepivovopuf.weebly.com/uploads/1/3/5/3/135311357/virevuk.pdfIn PDF document text
    • http://justamorem.com/windows_10_build_10240_update7mqpw.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/18726226357.pdfIn PDF document text
    • https://pewituzusab.weebly.com/uploads/1/3/0/8/130874049/c351ae83.pdfIn PDF document text
    • http://barajofa.mywebcommunity.org/place_value_games_5th_grade_free.pdfIn PDF document text
    • http://bestplacefor.rest/transformers_movie_autobots_charactersn382d.pdfIn PDF document text
    • https://bebojeraje.weebly.com/uploads/1/3/5/3/135302211/rujoburaxafog.pdfIn PDF document text
    • http://alternativeinfluencenetwork.net/24902106947r3rar.pdfIn PDF document text
    • http://silver35.ru/gre_practice_reading_comprehension81tdh.pdfIn PDF document text
    • http://zespodsvetkoy.site/lofixanovedowuloxikepuvulq0gnd.pdfIn PDF document text
    • http://fitdieta.com/modern_bus_game_simulator_apkxn2aj.pdfIn PDF document text
    • https://tapuwapefozex.weebly.com/uploads/1/3/4/3/134350869/zarofivi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tikomiwewo.atwebpages.com/20567708455.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/sabexepogideke.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/16932195711.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_off000194d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194D1 5272 bytes
SHA-256: c7e31dc971e90bb7a6017866c9494afe488ac82e62cb3965ef7482d897a72999
font_01_sfnt_off0001a6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6B6 10932 bytes
SHA-256: 326bb0f08fd0813ebc1af9513eebd139218e5106d7f6f1099ab85e581f6d7c21

Open this report in the interactive analyzer, or submit your own file for analysis.