Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb33334a3a4ea8c5…

MALICIOUS

PDF

70.2 KB Created: 2021-09-16 16:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 32898312d3a96abb245b37741861c0a3 SHA-1: 263dcdff07cbe04310a12e3c221f290548ffc792 SHA-256: bb33334a3a4ea8c59ec3f5b9059b1c65343f6ea113047cb697a7caaee3cc95d2
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users through multiple, potentially disposable, hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://abwingscolley.com/uploads/files/63416306489.pdf In PDF document text
    • http://elskup.pl/images/assets/file/zokofiwinozinix.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/64260277373.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/38765485234.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/exusizop.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/mopojilevixejofofose.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/xizupifubomozomatimik.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee5cd3e412---ledolosetida.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/paxefi.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/18372234915.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/gatuvedim.pdfIn PDF document text
    • http://hadt.vn/upload/files/14190453158.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/20118404887.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/redaburufadopemerojowibe.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/62627971909.pdfIn PDF document text
    • http://www.siposferenc.hu/html/92085333628.pdfIn PDF document text
    • http://jiab.net/userData/board/file/sijegefugugelixefejasodag.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/56857881708.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/78370995028.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/44910171509.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/24244642680.pdfIn PDF document text
    • http://synowka.pl/galeria/file/85566195156.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/19530268013.pdfIn PDF document text
    • https://33mobility.net/uploads/files/nosukudis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=creating+an+android+app+with+visual+studioPDF 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_off0000b3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B3 15060 bytes
SHA-256: 26f4f0de965a12b2de843b9fc047b32d9b91d20baceeca55b4d5165fdb0c4353
font_01_sfnt_off0000d996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD996 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AD 10952 bytes
SHA-256: 6d26c9a3a1ba6546bbe06a7321600c6a0703d003c009ea51305272df8eafccc0

Open this report in the interactive analyzer, or submit your own file for analysis.