Malicious PDF — malware analysis report

Static analysis result for SHA-256 91854e63e74ee67e…

MALICIOUS

PDF

81.8 KB Created: 2021-09-23 17:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fb14f745aabeb2310129ae2a7bed6bb1 SHA-1: 9596f34ac65b83eae42caf9cbca970e176a80afa SHA-256: 91854e63e74ee67ebf12f6c93ca040114f6e3881aa66cf82805703f57ae0342d
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://weddingitaly.jp/images/file/54438979429.pdf In PDF document text
    • http://kisito.com/userfiles/file/57787107044.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/29246349557.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/cd7fe771a17d0da41b54ada3b03d3da1/ketosawina.pdfIn PDF document text
    • http://tarp.longi.tw/uploadfiles/tubirosipudewafoxosupum.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/74469072048.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/fasigifadawipasasu.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/mojanig.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/juzaxinogatetezalimojuw.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210904052551.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/gikid.pdfIn macro / runtime command snippet
    • http://grandfiltr.com/files/file/15085624599.pdfIn macro / runtime command snippet
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a09a03c875---sawedi.pdfIn PDF document text
    • http://only-svet.ru/upload/files/44998864409.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/81555386164.pdfIn PDF document text
    • http://8njl.com/userfiles/files/jafejemosem.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/77036887790.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/bilulepifirub.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/25050344727.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/98989152195.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/sukul.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/47454756994.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210909_A801029983E3F161.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/64781395004.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/ximegilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+set+live+wallpaper+on+iphone+6sPDF 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_off0000d6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DD 10660 bytes
SHA-256: 8f0c596456fa1c6ade634ab075c04ad15d5c4167b31fe61b5af8bdd9ef51cff4
font_01_sfnt_off0000ef47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF47 19152 bytes
SHA-256: 101a55099ef47064114fcd4fdd663cbf3433af658f5d5d34e55e3ecd5d5c7e09
font_02_sfnt_off0001210d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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