Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9030683f4f61b32…

MALICIOUS

PDF

96.2 KB Created: 2021-09-13 04:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8a803fcb8f7bda081f49f714760f6a19 SHA-1: 7160c6e2219708859339feabfda991af6535e1a5 SHA-256: b9030683f4f61b322a2c1ed5300b6be381c76258555203e1956b43939fed458d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The high number of external URLs, many of which appear to be link farms or disposable hosting, suggests a phishing or malware distribution campaign. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 https://medvor.ru/uplcv?utm_term=game+of+thrones+season+2+123 PDF link annotation
    • http://www.beautyvogue.ch/Files/file/24777772362.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/rerarola.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/ninolomupeto.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/65373459436.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/jivuxesasafim.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/60756160855.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210910_5FE675AAFC7C5C04.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/sarerafafigoxegekevo.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/88633062691.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/57102829034.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/volasujegadunodowo.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/18480623483.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f65d4f5ab---durefenofulavuzubav.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210912103142.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/lijaxuzanawoguvolob.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/golovifipe.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/83715439855.pdfIn PDF document text
    • http://annabarons.lv/files/files/69318481871.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/newatatozefunoxawenaxa.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/zezevezeziriwosikenema.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/18134764365.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/vedafepi.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/matexoz.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/gilunuxugidukuxa.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/takijovarurowalibom.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/libeduj.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_off00011170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11170 18944 bytes
SHA-256: 79d42ed86c944b6f351491023db7220983bcc93db2843081c05951d076ad4c0e
font_01_sfnt_off00014302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14302 10724 bytes
SHA-256: f1e4f06e466c142d0b1e74597f6dcc59313a5dd207735a5947dce0cb08e25b89
font_02_sfnt_off00015b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1