Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22b1fe2598bf413…

MALICIOUS

PDF

69.8 KB Created: 2021-09-25 00:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4782122be746ac8254ef2ab8fa471f1e SHA-1: 511c53b2e2c4235195d263d950dbbdcb9bddb7f4 SHA-256: a22b1fe2598bf4135bded36edfc758eb9bb0e2d4f78474d4c0622a88d61b6aa7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://archism.ru/uplcv?utm_term=avakin+life+mod+apk+2019 PDF link annotation
    • https://sakura-bashi.com/uploads/files/202109112107249962.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/sikufinafebojejelel.pdfIn PDF document text
    • http://midospa.com/upload/files/fivolosewe.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/zidexu.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/zafefarabozawefanubin.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/daniwa.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/17097347939.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/63254783080.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/2741442533.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f127c6b6d7---23317946194.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/43838758793.pdfIn PDF document text
    • https://jss-moms.si/upload/File/pesojan.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/setawego.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/zitezevobefokufiwo.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/kepobuxinunedebotopu.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/fisifewupasojuluzapobusi.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/b8051c4bf57c8f644f9d27e6afacc024/75350611779.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/97443173927.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70111449325.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/zujesagijeba.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/bikuvavepefexos.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/lixamefatewunubabafudiri.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/22394000938.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_off0000b141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB141 10892 bytes
SHA-256: 18d1fe5d985dd5de89d78ce36ca029bd1da26b374519eee2cb27d7dcc353e148
font_01_sfnt_off0000ca78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28A 15320 bytes
SHA-256: e1bc3cd698eb72d443ccd98519544fe5617ad4f297a1b62a9de241cf9bc6dd6d