Malicious PDF — malware analysis report

Static analysis result for SHA-256 044b663e01a42c27…

MALICIOUS

PDF

72.6 KB Created: 2021-10-04 05:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4e96a6348bcae2b3c7644270e9a5b66d SHA-1: e40ff9e9a5538e1b4acb25e52186826b2489a1be SHA-256: 044b663e01a42c2744a9c0bf58b0158bfa44673f436552ca3e858970af17d26d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous external URIs on disposable domains, with a high likelihood of redirecting users to malicious content. The presence of embedded URLs further supports the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 https://cructi.ru/uplcv?utm_term=eat+more+beans PDF link annotation
    • https://himarco.ir/basefile/himarcoir/files/13652289112.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/godalivuguzagafujegejo.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/00tmgihj9hiaa9uvf68fkdnqe7/70216156538.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/210916140152813858p1k1v.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/71890447818.pdfIn PDF document text
    • http://neuroxl.com/images/file/bamotosizoxadamoxedejaxi.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210902072654.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210911220230.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/44806825116.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/75148036210.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/7775879217.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109200825307703.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/68982918483.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/35535129780.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/24491421051.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/xifopadepalufa.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/phi37u2tfigckafqk174c0t9ua/4499729831.pdfIn PDF document text
    • https://o-dance.com/upload/files/28975233179.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1633036442.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/vixuge.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/zumoxiwabuluv.pdfIn PDF document text
    • http://olapromos.com/ola/uploads/editorImagesfiles/61152255856.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/lalotagobonez.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/37300570758.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/sidafevoj.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/72480038344.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_off0000b821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB821 10256 bytes
SHA-256: f52cbc686583a7d2598b0c848e67c683768b8f9d72f5d7e5fb92aefd2b78ce10
font_01_sfnt_off0000cf2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE740 17836 bytes
SHA-256: d294c176aabe4eac2613f0e7ee3315e7de07355fe840dd1922110ced24191a25