Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d286e14202151f7…

MALICIOUS

PDF

74.2 KB Created: 2021-09-11 20:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e9dfc3e8c8887e0bc599fb0d0453c2ec SHA-1: 8cfb55bee9c760f2c4f952f3f5acaf847c909009 SHA-256: 7d286e14202151f7ff56f973bdc965aae425dfb180c519217e9aa94596b10f2a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm designed to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution attempt.

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://twsl.mingann.info/upload/ckfinder_temp/files/20210907111449.pdf In PDF document text
    • https://zbmbudomont.pl/userfiles/file/ganidipinuma.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/2933468557.pdfIn PDF document text
    • http://prosquash.by/data/95946139699.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/91233647860.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210907192046832.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/pilowesisixivu.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/55303410629.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/63962858311.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/rdeglrc0nqr9ilahfbt4bto4bv/84245907845.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/54873980038.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/gajurapalipapasegigani.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/29009041077.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/1745616169.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/deparirosesuj.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/69232483471.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/powuramolidorerezinerugab.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/24136860165.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/bowunuwozulo.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/96681517155.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/kazazumok.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/41374395227.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/mixoluto.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/zerofodebaloboko.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/62902977975.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=my+city+boat+adventure+apkPDF 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_off0000c085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC085 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89C 10800 bytes
SHA-256: 1b410a79ad0ae931126fe4f2791023c1d8c34657aa383ae59bf41fbed2cb24d8
font_02_sfnt_off0000f176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF176 16368 bytes
SHA-256: 32788368fcdbc7d659e3da01e1fa678e7293b105702e4cd3dad96cd480559eb5

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