Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7336c5b0110babb…

MALICIOUS

PDF

76.8 KB Created: 2021-09-14 09:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2f9a1cede50ffb924bef94d667c810fe SHA-1: 9fe78e8f8420365312e7b72a1abb4ce9acf82f87 SHA-256: b7336c5b0110babb664d88bd2d1e0ad7d5248e56bf2ef8aab69c8ff169460e4a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many of which point to disposable domains or link farms, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://scandinavia-ex.com/images/blog/file/venavusokaj.pdf In PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8f7b22e05---15265658001.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/pozafukabetagujas.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/guvozetalojixaronigufag.pdfIn PDF document text
    • https://pokereshop.cz/data/file/papututeretalasipew.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/88745293119.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/mopuzizefifapirona.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/dusibavude.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/pulazogafo.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/92340978429.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/tudotimiwilegatudirudeb.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/sewipeniwoxazowaxufu.pdfIn PDF document text
    • https://conrays.ru/f/data/58694355133.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/wotemoladura.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/34769540877.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/fivadefub.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/genoz.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/zarezevazofas.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/mowivexunidenobogapuv.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/tifukarirusef.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/22918913572.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/89229743329.pdfIn PDF document text
    • http://freeski.hu/freeski/file/fupukeganebagixodege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=a+bug%27s+life+full+movie+123moviesPDF 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_off0000c7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD1 17240 bytes
SHA-256: b4f929fddd92d8e11a0a02413bf034c0f93f901f8e0d2a7cef60a2d378a82cfe
font_02_sfnt_off00010ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA7 10760 bytes
SHA-256: ec41f1dffd748f75b64cd696f4b6bfa5b5a91db3fd5313713be1a8776eebe57a

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