Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e36bb229fc7c97f…

MALICIOUS

PDF

76.4 KB Created: 2021-09-15 23:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4a51952abd9b7acd4a3aa6e06490e54d SHA-1: ab41484cbdc3e986084947c5add39fd22c7af30d SHA-256: 3e36bb229fc7c97f1c4d8ef0e7e03c05b68def773634b1fc65bba72ef6260ec8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains embedded JavaScript and multiple external URIs pointing to potentially malicious PDF files hosted on disposable domains and IP addresses. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to download or redirect the user to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://traviet36.com/upload/files/banituwajosojuwasesumo.pdf In PDF document text
    • https://ladangmimpi2.com/contents/files/zozilewe.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/39852784937.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/maseretozewelinotapideji.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/77449949229.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/zazalimisuja.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/dupemebagapas.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/dikit.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/69300943101.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/15684003278.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/bavibosuxowotakuz.pdfIn PDF document text
    • http://getdol.com/page_data/file/xomuvitodegolugi.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/27490982749.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/69483739848.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/zomilakuwurodijafulekir.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/79065627793.pdfPDF link annotation
    • https://aspit.ro/imagini_ws/rudutonedixatemex.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/13679352853.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/mosaporo.pdfIn PDF document text
    • http://kahasat.cz/data/file/80676414607.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/nazarimulewapukutigeven.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/28446124561.pdfIn PDF document text
    • http://rc-modeller.se/images/file///xunupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=harga+second+hp+android+samsungPDF link annotation
    • 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://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_off0000c98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98D 10908 bytes
SHA-256: 8451072477c5c786f4e6403d55a907bf0312091405465e4778295f1b1bded835
font_01_sfnt_off0000e253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE253 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA65 16212 bytes
SHA-256: 9bb68a7c6918c0a1a471643e221d358edf3686bff65b3f8f75432ec7ac2ad3a4