Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5956b9065fae51d…

MALICIOUS

PDF

81.6 KB Created: 2021-09-15 23:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4e551b023163a1f00c00316ce94b3414 SHA-1: f588d2ff639cfec4f9bf59672c8c88a3d7910a21 SHA-256: d5956b9065fae51de91f0d73ff55bd37d4f319f1b023a236f40df50850616ffc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URLs, many associated with link farms and disposable hosting, suggests a phishing or malware distribution scheme. The heuristic 'SE_DOWNLOAD_BUTTON' further supports the interpretation that the document is designed to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=bixby+remapper+apk PDF link annotation
    • http://liderzy.natura2000.pl/imgturysta/files/54855523966.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/58107460078.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/kamoviwo.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e59fe477bd---pifalopepajebire.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/8025322925.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/lodurodire.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/14708395490.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/68941664401.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/kivusosufukufa.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/gereze.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/96884785782.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/dezevegoga.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/jujipilapevalejeparoxegu.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71046397582.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210905_112644.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/cbb11ac72894eff9687eaa1e2b17c989/wolel.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/97039029832.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210911152034.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/lukabemoxuzeli.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/72943850651.pdfIn PDF document text
    • http://innotack.com/userfiles/file/93484865694.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/42418990909.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_off0000da14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA14 10376 bytes
SHA-256: 845ebf9030ebf1101a344ca959ebf69f28a6a8114ced472a9f294470424c0a10
font_01_sfnt_off0000f16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001097c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097C 18228 bytes
SHA-256: 2982d7c3721823571626cf709fcf69b68eca442ebfcd59412487212c79123b54