Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a92188eba749c1…

MALICIOUS

PDF

71.0 KB Created: 2021-09-24 20:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9e9206621a7b5e1515773eb87f1b821c SHA-1: 34a44a9174b6bd91ae92d2bb0947ee833cfb0275 SHA-256: a4a92188eba749c12a51fa342baf1dbc97a8f0bb3e2e190ac6271e69614d34cf
146 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to disposable domains, a technique often used to obscure malicious destinations. One of the extracted URIs points directly to a known malicious IP address, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://crabandclaw.com/uploads/files/kokos.pdf In PDF document text
    • http://anhbanglaw.com/userfiles/file/tewurugapineteva.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/28779294280.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/namamodelefovakexo.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/dodabipujesapatola.pdfPDF link annotation
    • http://eau-msu.ru/ckfinder/userfiles/files/pogonizuroradixif.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/0fde1bbcglrgah17568ef4s5tk/guziri.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/8319519353.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210914192039.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/girobajomuzalepo.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/sekofazodesawexinojatol.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/nalurunamojul.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/xofurukumaj.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/pojibetewisovokutam.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/91542387427.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/vitogifad.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/kisadesalovudola.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/nuvomikebolubagejoloju.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358e54d5b37---wunavoxodejuvabugutagol.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/29018047699.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/33206342883.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/62436184517.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/bofeliwulod.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/wewawoxovudimazatox.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/sekivobowanef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=the+journey+of+karma+full+movie+download+720p+blurayPDF 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_off0000b15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15E 11480 bytes
SHA-256: 8cd941b96bfe906fb95ca1d2bedd9347db62f3b2ff2f7fca2354ea78f801197c
font_01_sfnt_off0000cc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC21 15832 bytes
SHA-256: 811718b585e9131d4e6569ca93a85d49eabde879d795c01e2cc66a3d206fe920
font_02_sfnt_off0000f441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF441 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1