Malicious PDF — malware analysis report

Static analysis result for SHA-256 97fe6bd923a4fd6d…

MALICIOUS

PDF

82.3 KB Created: 2021-09-20 15:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9e6293c8349a845778cbfbb7ae22281b SHA-1: 862744f15ec7279829a5e0177336b0b9e0b49a6e SHA-256: 97fe6bd923a4fd6d8501e275db316fb8d44ffc8eb388c1d1d32395d4a481a48c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=free+apn+for+android PDF link annotation
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/10336111930.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/51306568749.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/81365096792.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/25621276113.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/dulifujupev.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/xozukakesonuvatadekut.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/35444378912.pdfIn PDF document text
    • http://chengzechem.com/upload/files/bixilesobev.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130195f334c5---rokotuwu.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109120518173600.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/56829143249.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/74960306175.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/3175770593.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/12012509570.pdfIn PDF document text
    • http://retailcop.ca/files/gejalorejaweridutid.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/vemurifepinuzubulezefi.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/zaxudurepitibuge.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/53640105590.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/kuvazigesapafosevovaf.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210902_070121.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/91851161270.pdfIn PDF document text
    • http://charivne.info/images/file/4241085314.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_off0000dcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF4 18488 bytes
SHA-256: 2b0576d05be3340ffb2825b2844bbb8323a5b3f6e2dcd379213551fcc8cc551f
font_01_sfnt_off00010d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D26 10156 bytes
SHA-256: e83b8e87bc8689de4a2b97b4756b5da55004953dcc490d3c48fcd7623c2014bb
font_02_sfnt_off000123d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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