Malicious PDF — malware analysis report

Static analysis result for SHA-256 e90f6da1c7cd6e7e…

MALICIOUS

PDF

82.0 KB Created: 2021-09-19 22:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c50771d6b3e5ba663ec3d25ef85ec36f SHA-1: 72cddcf9f616c1828c180697a64d47fd5a8c85d1 SHA-256: e90f6da1c7cd6e7e328619660bef4f59c0755a4f6d46a042ab50301184e8cfd3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a large number of links, suggesting a phishing or spam campaign. While no scripts were explicitly extracted, the presence of many external links points towards an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://stphilomenaonline.org/userfiles/file/75414650896.pdf In PDF document text
    • http://bindashnews.com/userfiles/file/ravakuluwewetatix.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/kefozupogebezizufugerox.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021091011333696.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/65022828417.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613012ff23f3e---notesobekopajibivomalas.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/11658979274.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/zulis.pdfIn PDF document text
    • http://packturf.fr/files/jawovedumamo.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/46072008798.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/85072583373.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/161434ac4f3dd8---jokagujivamubit.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/lipawaxofikuji.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/raruzamonebaruxadelaralo.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/wokapa.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/bezatakozitaxinatazurim.pdfIn PDF document text
    • http://atrsara.ir/resource/files/kinemotadaguvekisusifeji.pdfIn PDF document text
    • http://devveb.net/userfiles/file/97609424806.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/fesixopelesobajiv.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/88892654768.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/fiderakafenigakekar.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/18473778408.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nejepolutikenemijedek.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/xidipef.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/85690267898.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/verusinavifofebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=game+online+minecraft+classicPDF 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_off0000dd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD86 10536 bytes
SHA-256: 7dc1790a5e20ccf16c807954418306700ab0ca351c1b53ed37e08121657e8af2
font_01_sfnt_off0000f581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF581 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D93 17252 bytes
SHA-256: 169e6eee5aa8fbe365ee5a7771ad39530f9bddd13141f64c5a2a2bc38a5c9b3c