Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc90380999c35834…

MALICIOUS

PDF

108.3 KB Created: 2021-06-09 11:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 32c739fbb566220bfc76ccede2396aee SHA-1: 4113f31082d29223f84a03853b001ddfaa48cb22 SHA-256: bc90380999c3583422a273dc64654a8e06dc2f5a767e41cd6ed0531f06fa1f7e
194 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document likely used for distributing further malware or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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 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.
  • 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
  • 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://crysiq.ru/pbw?utm_term=dhruva+full+movie+in+telugu+online PDF link annotation
    • https://minadefimufev.weebly.com/uploads/1/3/4/6/134635785/8740756.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424007/normal_6033abd60421a.pdfIn PDF document text
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/kavafaniluvena.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391893/normal_5fefbe279978b.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/namuwuj-gajigaledavatel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380699/normal_6040afcdbb681.pdfIn PDF document text
    • https://jodexozemusokut.weebly.com/uploads/1/3/3/9/133999246/3917567.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454168/normal_5fe4b2040cc1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412570/normal_602a2be56efa2.pdfIn PDF document text
    • https://xoropugu.weebly.com/uploads/1/3/4/7/134707238/120f10f8d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468838/normal_5fe26559a32db.pdfIn PDF document text
    • https://vavixama.weebly.com/uploads/1/3/4/4/134471840/julopizazoji.pdfIn PDF document text
    • https://vifabuwu.weebly.com/uploads/1/3/1/6/131606679/fariginopobevobuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365583/normal_604cba681460d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413701/normal_6004684ddcbef.pdfIn PDF document text
    • https://talegojozafadi.weebly.com/uploads/1/3/2/3/132303005/4093a.pdfIn PDF document text
    • https://gevexewu.weebly.com/uploads/1/3/4/0/134018209/fde0e.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/5403100.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3170179-2b46-4180-a9ad-b999a7f7387f/fibupuvimumeduga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7059d3ad-50f7-48db-b520-5629ee802f5c/89927387481.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bbf8f13-135c-4e54-9f96-4a3cf8c64934/crire_un_texte_au_pass_simple_cm2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1823f21-7679-4c6b-8eef-6c1c4a55550b/85509559076.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6864071-145f-461a-9faf-23688e09c720/probability_of_simple_independent_and_dependent_events_worksheet_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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000154a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154A0 5064 bytes
SHA-256: 47ee16fe564e5f866bd3df8acf58e61054d3600756e7e87c61e339d17bc26d87
font_01_sfnt_off000165c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165C2 11652 bytes
SHA-256: 36e8ef4a21e3de60d5b37e1f369f63370dbf8a2632035b2cf384786af34eea4f
font_02_sfnt_off00018d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D61 16164 bytes
SHA-256: e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6