Malicious PDF — malware analysis report

Static analysis result for SHA-256 365590a61a4c62ab…

MALICIOUS

PDF

87.6 KB Created: 2021-09-19 03:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9170ee17853a9ef07ddb1cd711f6340a SHA-1: 856d5edb66a4df4c0ece9e283d8ad0c8d8fa112c SHA-256: 365590a61a4c62ab94e00969a02b3f6f8dd5c816b854515d69182bb3e32b347a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://lpxs168.com/filespath/files/20210916051538.pdf In PDF document text
    • http://uniradioweb.info/userfiles/files/54087555040.pdfIn PDF document text
    • https://777mto.org/contents/files/11370425355.pdfIn PDF document text
    • https://cathita.vn/upload/files/kadurog.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/56518384557.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/woperujalubi.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/texipexedu.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/zolamufoxoxe.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/81192525168.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/xasuvujaxunolupowime.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/xesukananerimesemozala.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c7b04115c---61206911092.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/77685909681.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/duzugapi.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/belidikoremuga.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/99171852747.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/18164743208.pdfIn PDF document text
    • https://hoavily.com/uploads/files/mejosiponedewoxotov.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/kejejezunazagibunuzuledo.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/54130563952.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614303c3d83da---ximimeleponebufuru.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///98695735372.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/janinedufotifuxukura.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/52092877349.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=best+political+games+androidPDF 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_off0000f40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40E 10908 bytes
SHA-256: 8a42f093263d72c27b784e9332cafa0cd2548790ed29b57aaf8a60efd22c4ba7
font_01_sfnt_off00010d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D15 16992 bytes
SHA-256: 01146d1df0be1742fa895c52fcb6eb01514febdcd3a58200fa9817d9031601e2
font_02_sfnt_off00013940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13940 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1