Malicious PDF — malware analysis report

Static analysis result for SHA-256 a233efb33b3703fd…

MALICIOUS

PDF

83.6 KB Created: 2021-09-09 10:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6f4002b9ef48895e0a518aca45d2156a SHA-1: e0243377b7c6834b2204ea22fe81f99bed6ef1b5 SHA-256: a233efb33b3703fdae1b7b4dc96742bb56b325e6be4339ca8502e06658773b5c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files on distinct domains, indicating a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://france-ex.com/images/blog/file/voveriguviferepajoxugimo.pdf In PDF document text
    • http://integrotech.com/zdjecia/file/55171804783.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/nagix.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/23727226698.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/44825732118.pdfIn PDF document text
    • http://chicopharm.com/upload/files/takofevasaxogapofelijimat.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/42358924144.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/48894900964.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/lojumukaxodexaludipira.pdfIn PDF document text
    • https://grouptm2.com/contents/files/96973944751.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/32477426993.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/botubosobin.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/51077796150.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/ronorisigo.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/vivasijugevovigufopa.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/75184388182.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/26938579607.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/makowonojinixa.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/suzapada.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369f356776c---lalidulilupigiwesola.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/pawilemov.pdfIn PDF document text
    • https://sambelteri.com/contents/files/sapanogozaposus.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109081855448860.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/xevebiridewupabin.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/luzafefulezepibut.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/zofozemeke.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/jekave.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/31928136777.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=cambiar+tono+de+mensajes+androidPDF 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_off0000debe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D0 18740 bytes
SHA-256: 69c81d5be84a7578736feb07c1e8af47da12947eac05eeb4440e09ceca2cd904
font_02_sfnt_off000126a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A6 10664 bytes
SHA-256: b6a4c95a578741be3d1e30c27130b46379f618b56e8dd72e2ea2b91b4e92e4af