Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc58dff16e82597e…

MALICIOUS

PDF

89.4 KB Created: 2021-04-12 12:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 83801889ae1d21d0d75b06ca7baa48ac SHA-1: 1c86423a3efb736050c3328651d68e6095fd6988 SHA-256: bc58dff16e82597e52969f8d944464ebd5e265bb0d0fa54b47d667ea62e11117
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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
  • 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://xezojetit.ru/strik?utm_term=basics+of+indian+stock+market+by+angshuman+adhikari+pdf+download PDF link annotation
    • http://boldly-grow.com/lurusivelefunudeltcmkc.pdfIn PDF document text
    • http://realwockyc.info/gofogh3r3p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450356/normal_605a9633130c4.pdfIn PDF document text
    • http://onsideball.info/36143106073qkvda.pdfIn PDF document text
    • https://cdn.sqhk.co/bumogebiz/iNichgo/zatalavo.pdfIn PDF document text
    • http://keepqifi.space/namafenularawoiv6zp.pdfIn PDF document text
    • http://maxist.ru/nelaroda3gcrf.pdfIn PDF document text
    • http://masito.space/govefetezipifinaterekoniw4six0.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/dhigsjX/34954412353.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/rTlprie/kafawemej.pdfIn PDF document text
    • http://reduslimitalia.site/230986275035i4b2.pdfIn PDF document text
    • https://zuxubemusaf.weebly.com/uploads/1/3/1/4/131453996/5f118.pdfIn PDF document text
    • http://zebrait.fun/manuale_cinema_4d_r20spysc.pdfIn PDF document text
    • https://cdn.sqhk.co/ropobemuma/ejgngf5/chocolate_crinkle_cookies_without_chocolate_chips.pdfIn PDF document text
    • https://cdn.sqhk.co/lokiwejawe/heickjh/ufc_254_uk_time.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500897/normal_60234ce2e4fbb.pdfIn PDF document text
    • http://on-arenas.com/47146570395hs5wv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482426/normal_600fc63cbb77c.pdfIn PDF document text
    • https://gumewutudeg.weebly.com/uploads/1/3/0/8/130813982/zomelanopolopatinuda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://togaretib.epizy.com/32257775598.pdfIn PDF document text
    • http://xidiredojowezi.epizy.com/kinusem.pdfIn PDF document text
    • http://nadurajamewe.epizy.com/xegis.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_off00011d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D88 6016 bytes
SHA-256: 58c42e6fac376dbd5fb7fc5ec1039e8e13713cfcf80114816f4d0e7d8549bca3
font_01_sfnt_off000131f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F1 11000 bytes
SHA-256: aa21bd0caa0d91828c91712454533ae8f328f6ef8d6a6f2a1a98b71c425f36b0

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