Malicious PDF — malware analysis report

Static analysis result for SHA-256 b271b6994880250d…

MALICIOUS

PDF

77.9 KB Created: 2021-09-11 13:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8edb8e3bb2cd3887ae317f1a683010a7 SHA-1: 01ffb98d77ebba624f1b1c95d9ae537ccb3c23f7 SHA-256: b271b6994880250dd999920cf53085b8ee3113c88c4d5c556e786fac765b41f1
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct hosts, many of which are disposable. The embedded URLs point to potentially malicious PDF files hosted on various domains, suggesting an attempt to distribute further malware or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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 https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16139bce599a1d---redukidorikulug.pdf In PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/98088463013.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/jinadezadugusatovenoji.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/43980746626.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/bobevusawaribofu.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/11775684469.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/69322137217.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/febusobixaxadovo.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/39625656459.pdfIn PDF document text
    • http://carszana.com/image/upload/File/pelaposurunuvakuzozimomu.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/tipidibuzesikewivizalon.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/54868918992.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/donuxidal.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/44406893400.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/fugarifilerepilufijabelix.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/56623395010.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109070953341502.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/64227768846.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/95195433308.pdfIn PDF document text
    • http://idcla.net/upload/files/77652319463.pdfIn PDF document text
    • http://babamoleskine.com/files/file/tusarefotufolikosefa.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/loxenawekivarajidaru.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/13ee3e708cb17a23a0dd41ff7d09776a/zemokatagowuf.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/dizonagutubimobitibefuvo.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/nebuwokutamalabujis.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/telesapepogiwibafumukodan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=sat+reading+test+1+answersPDF 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_off0000cccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCF 10472 bytes
SHA-256: 00a16b393d43f02b7545298f9c42b496175ed34d8173c6eaf74b1d512fde97ad
font_01_sfnt_off0000e494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE494 17924 bytes
SHA-256: 536da9bfef97b0b4f76d64a0b2da4dcd6ca579e5ac6026eaaea0019422cef4cf
font_02_sfnt_off000111c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1