Malicious PDF — malware analysis report

Static analysis result for SHA-256 4347ec1f851ed35e…

MALICIOUS

PDF

83.8 KB Created: 2021-09-14 09:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b1cb34ab47d84464dad931d76b354cbb SHA-1: 52bb5181b316c19cdfed79249157f077f3e9d108 SHA-256: 4347ec1f851ed35e2b715d2cdcd9561ff4f8af3a42987d57fb2354804f0ef001
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external PDFs hosted on various domains, many of which appear to be disposable or low-reputation. The heuristic 'PDF_RANDOM_URL_LINK' specifically flags a link to 'http://carraracucinecomponibilitrapani.it/userfiles/files/56489567450.pdf', indicating a potential phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://adetexfoamgroup.centralcms.cloud/galeria/files/24911211086.pdf In PDF document text
    • https://yodishit.com/uploads/userfiles/file/garurobozijilemopedora.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109030346002689.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210905163548.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/korek.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/92405365523.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/giriwizonuvapepizopu.pdfIn PDF document text
    • https://hoalavender.net/upload/files/62805709171.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/38389780707.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/lobevarunelufisewufiputo.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/65528377088.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/80527142248.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/16005452176.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/19143456849.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/56489567450.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350ca5c5080---30640434214.pdfIn PDF document text
    • https://serka.com/serka/upload/files/86061799334.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/61884571892.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/sekixoni.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/nafunuminusosifuriseguni.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/semisalepudi.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/vuvuzuwafolidope.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/26355059833.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/43666377830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=best+apps+for+firestick+july+2020PDF 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_off0000dee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F7 11100 bytes
SHA-256: b10c4a8a5d938bf7d23d32580cbe78b6fdc158b96a19675b1a9ee03b879f3a04
font_02_sfnt_off00011119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11119 18860 bytes
SHA-256: 4647df46c8535ed712d216849684e2610a6163a47cb03b6ff01f3db570be26b4