Malicious PDF — malware analysis report

Static analysis result for SHA-256 38bc53debd31f205…

MALICIOUS

PDF

88.0 KB Created: 2021-09-17 16:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 86f6ff0d68816406074489cd9e5a4132 SHA-1: 7f2e8f17084c161ae287028753064888b5dea868 SHA-256: 38bc53debd31f20552836a41f7b1b3e9d831ecdd5740685dcfc5bf728bd07ff3
74 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing numerous links to external resources, some of which are hosted on disposable domains. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to direct users to potentially harmful content. The document body was unreadable, but the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f15f4b1454---bojefavulazukimos.pdf In PDF document text
    • https://intrigantka.ru/images/userfiles/file/jogujujezegub.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/desarogig.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/regikobabunajo.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/23197308372.pdfIn PDF document text
    • http://schokofontaenen.de/idata/gumabokega.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/73546839302.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/lutikuletisolopezupozago.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/83770186435.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/fizun.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091113482924529.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/vusozilutusol.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/19491653161.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/25801480193.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/zazejuvelagapunired.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/64938825484.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/74244996588.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/koxike.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/zotejiporevugavomuto.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/29006270718.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/fagipiwefefuki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=minecraft+download+apk+visionPDF 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_off0000eb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3A 10848 bytes
SHA-256: 009b247532a4ef634c259965996012b0829ba88e61bc98f7a7e10c27ee0fbc4b
font_01_sfnt_off0001047c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8E 20360 bytes
SHA-256: 699ae165efe3a46ae6906b68d89e6c18aad7c859b1fd222f16a73818bf30efcf

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