Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d119d840981cc4…

MALICIOUS

PDF

74.9 KB Created: 2021-03-14 20:00:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e2d22753bb44b19f191d2c0c18cde1da SHA-1: 9a030c8cd5c8c124cd8cb1031fefeda5e47ee53e SHA-256: 91d119d840981cc4ebcb9e998c157d46956137f979d1cfb58c8db877013281f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://ponafet.ru/award?keyword=collective+agreement+definition+pdf PDF link annotation
    • https://labelamujevodit.weebly.com/uploads/1/3/1/6/131606697/66bfdb582c0c781.pdfIn PDF document text
    • https://cdn.sqhk.co/fotajoge/doSZie3/globe_prepaid_roaming_text_promo.pdfIn PDF document text
    • https://pixamowogiru.weebly.com/uploads/1/3/4/5/134590731/460a94.pdfIn PDF document text
    • https://cdn.sqhk.co/fipakebeb/ihbWHji/63703377973.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/hd4gjpf/mettere_stickers_su_instagram.pdfIn PDF document text
    • http://zanartcc.net/kezudevisavivewileruxeml3t1y.pdfIn PDF document text
    • https://xapenivivafozeb.weebly.com/uploads/1/3/1/3/131379266/kumojokiwiwivexaveju.pdfIn PDF document text
    • http://smartcreditscore.info/tojesilokebavo85r31.pdfIn PDF document text
    • https://cdn.sqhk.co/sagitusat/hbnWHha/fegegut.pdfIn PDF document text
    • http://sosyaltakipcipanelin.com/thermolyne_30400_furnace_manualekohr.pdfIn PDF document text
    • http://save50it.info/xuzegorowoxug5o9wk.pdfIn PDF document text
    • http://aycotoro6.xyz/what_is_the_cognitive_approacho8yzb.pdfIn PDF document text
    • https://cdn.sqhk.co/lutadamafe/Niba8gi/kedugidirin.pdfIn PDF document text
    • https://cdn.sqhk.co/duwenaxiseve/pgdhg0N/best_sushi_catering_nyc.pdfIn PDF document text
    • http://italy-small.space/ropokuzarenexitifazafp4xl.pdfIn PDF document text
    • https://mabaxezo.weebly.com/uploads/1/3/4/7/134766945/c5c5497e.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/kelukakeb/ncert_books_online_purchase_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/biturakobalerir.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/dobivasija.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_off0000e9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A3 5260 bytes
SHA-256: ea62c0414536df1a6ecd35fa65268b97d5c34fb1d3db2bd8c559a9c7ed7d4b79
font_01_sfnt_off0000fb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7E 10180 bytes
SHA-256: fca8663db615ec72a59a4f75e19736c2a8cfa8d630f5048cc76e78ba3bb3eabf