Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d906ef360d633b7…

MALICIOUS

PDF

76.2 KB Created: 2021-09-16 23:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 17e00a72ad092ccdb4dafca6001da658 SHA-1: 02d0c47bf8293c8b6415c35de3a200b58afc3301 SHA-256: 8d906ef360d633b7d73b651eb5cedfea017dfc3d0039f8535e3ad47e49f49283
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior, indicating a potential attempt to manipulate search engine results or distribute further malicious content through these links.

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://bbfederico2.net/userfiles/file/solif.pdf In PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/9814219672.pdfIn PDF document text
    • http://calisnt.com/uploads/files/zutunenavavixevuruxarek.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/jawofezatagotav.pdfIn PDF document text
    • http://silver1979.com/upload/file/90524023573.pdfIn PDF document text
    • http://koala-al.com/d/files/rulon.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/vajilutis.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/nuvabitunebasakixopofoza.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614025dcdc7ad---rapadolukiza.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/dosup.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/17989853477.pdfIn PDF document text
    • http://boki.hu/editor_up/95290527837.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/zojakojalinidasele.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/24877919162.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/64248081180.pdfIn PDF document text
    • https://asi-filter.pl/files/file/xanifapozir.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/bibizurabunu.pdfIn PDF document text
    • https://afma.pt/site/upload/file/39231864974.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/48511836568.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/etqpa5e5clam757cgjjgteqbj2/puvurananukurujusala.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/84203924419.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/kajazuwixum.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210914094418.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/6296880666.pdfIn PDF document text
    • http://belovosushi.ru/files/wuzaratemibedezoxopibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=roohi+full+movie+watch+online+hdPDF 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_off0000c506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC506 10772 bytes
SHA-256: 8be6319b826ba9f597e1497e4c02eae8bf3c88668477597da2595cd122ad1fab
font_01_sfnt_off0000ddab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAB 17712 bytes
SHA-256: 38e98d4774a8fd6bc0467555a12adf922be5ad369018ac36c16b5d039b7aa3a2
font_02_sfnt_off00010b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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