Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b291339c7070488…

MALICIOUS

PDF

71.0 KB Created: 2021-09-21 12:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6a290500ff3e1996bf41f6c3477d574a SHA-1: 8b2e1ce79c764ca6da84a3475b7921e122df571d SHA-256: 2b291339c70704883de78621b1f186e813b8ed49fc9aef5c3430d551bc0ba402
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically pointing to a URL containing 'uplcv' and a search term, suggesting a phishing or malware distribution lure. The PDF structure and the presence of many links to potentially disposable domains further support its role as a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pistant.ru/uplcv?utm_term=final+fantasy+v+apk+data PDF link annotation
    • https://lemarko.com/userfiles/file/14899304623.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/14737303891.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff84d87e0c---36640674748.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/66611303595.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/73144850661.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/70425533529.pdfIn PDF document text
    • https://phnews.ro/files/file/gafalewiwag.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/wosowulasumuk.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/11060376498.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/tuwironofuxusutori.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/21769518009.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/19973780608.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/laniwetotoxanukalifafonu.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/f206c9f4b2fa13593aa8ff514168f627/9388232161.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/zojafesokazabepufadanar.pdfIn PDF document text
    • http://uhorder.com/upload/files/70765586090.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/xazepezuraxekaziki.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/vojab.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/68440543108.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/17053355651.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/rezekegixadivigam.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/93377830606.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/3196827428.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_off0000b1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BD 10388 bytes
SHA-256: 00cbb747b496de7e0054784b21a54ca3e4bb370bd92c4d30ada8aada4d360026
font_01_sfnt_off0000c957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC957 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE169 17548 bytes
SHA-256: 7d1b8bf236c56b20df5b149d974f18080699c26545b6603b241b7f05a0f729d8