Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec4b6518785166fc…

MALICIOUS

PDF

84.4 KB Created: 2021-09-19 14:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d06520ed70e9c2331cd2f16fd2e33351 SHA-1: d517a7d933fc732f2ea223087f336699100000c4 SHA-256: ec4b6518785166fc3ef9ac59258491eeb4fe4a5efd33a756db137c0309c19ddf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or content-luring scheme. The presence of embedded URLs and the overall structure point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://synerhu.ru/uplcv?utm_term=dumbbell+workout+mod+apk PDF link annotation
    • http://alfonsoguiggiarchitetto.it/userfiles/files/57963816100.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/18647873581.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/tofevu.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jadamewawigakesag.pdfIn PDF document text
    • https://computerzone.pk/file/71662186421.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/319261281.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/bamixiwipuwegusasijezis.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/zobogomapizesadexiferu.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/kidejonijitode.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/18998133567.pdfIn PDF document text
    • https://pixel.bg/img/file/telajitefofuvawid.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/jasugawi.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/34466535527.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/62994020587.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/7682036690.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/susibuguvorokavo.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1614229dbc6c5b---2579792025.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/kikajasojog.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/85647929168.pdfIn PDF document text
    • https://slicktechproducts.com/newerac2c/userfiles/file/60644748183.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/60609138635.pdfIn PDF document text
    • 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_off0000e73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73E 17388 bytes
SHA-256: e817e92417e228e5029c15bb5b42208d1fd20c17dbbc244e9d7e841146e42cf7
font_01_sfnt_off0001147f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147F 10608 bytes
SHA-256: 37d3736d7c89d39bbb2e23e188b17542253812180d3687add2d72069f41f44c1
font_02_sfnt_off00012ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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