Malicious PDF — malware analysis report

Static analysis result for SHA-256 425cff7fa13f5b5d…

MALICIOUS

PDF

75.9 KB Created: 2021-09-13 00:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3a807fd60daf77f3625a3e04eba8805a SHA-1: 12e38b534bd6f2754b3c5783a4211952b24c659d SHA-256: 425cff7fa13f5b5d0eebaaddd63434c52d46fe6783a146216c0d3c00ecc01f12
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to download further payloads. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • 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 http://heyumpnd.com/userfiles/file///wogoref.pdf In PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/manevapelapaxazog.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210831174419.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/17747888870.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/lavunonarikubano.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/xokodidigew.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/lebutuveb.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/turibawisefata.pdfIn PDF document text
    • http://imbirimbir.ru/files/jasadaser.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/saxuxelibuxujularosodagum.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210902141418.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/43061664652.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/suzuloganivoxabamekozovin.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210906155357.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/dexudunejeleguxusajediza.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/98424950090.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/munazusozikavirunufoza.pdfIn PDF document text
    • http://www.siposferenc.hu/html/65015358933.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/gazonikalikomaneme.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021090323121770554.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/88024378318.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/rumamajamunasalexi.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/12538047402.pdfIn PDF document text
    • https://natinsel.com/imagenes/file/11196721632.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=best+phone+under+10000+in+india+non+chinesePDF 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_off0000bdc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D8 19636 bytes
SHA-256: 9c1e2217b04b24777e03d0b0a56c83fbc98fc5502faf0a3f0ba534f842cd03f9
font_02_sfnt_off000108bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BF 10892 bytes
SHA-256: de9f4e735e2f5fbefef7e41f54a137c5e77bd75eb59a94b2e01088f8fe83c19e