Malicious PDF — malware analysis report

Static analysis result for SHA-256 44f60b58bb2f4562…

MALICIOUS

PDF

83.3 KB Created: 2021-09-16 16:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 304ad1768d3afbe8056c99449ce1eae4 SHA-1: fdd87fd6e456dd3962dacd3ccf898f6feac7d253 SHA-256: 44f60b58bb2f45628820f4b9c2171742a9d916ec7002b08962e986a604ae81fc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. 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 redirect users to malicious sites, likely as a first stage of a phishing or malware delivery attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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=first+derivative+calculator+with+steps PDF link annotation
    • https://weilmclainboiler.ca/fck_upload/file/lutuvaradejakekozapalulal.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/tugomejeke.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/leparuxumu.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210916010721.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021992128378157.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/53627242064.pdfIn PDF document text
    • http://boki.hu/editor_up/tuzebuda.pdfIn PDF document text
    • http://mweb.cz/images/file/63490867715.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/62753343855.pdfIn PDF document text
    • http://showdoimovel.com/files/files/43465917419.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/28443767293.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/feredubewipogekofaz.pdfIn PDF document text
    • http://sdes.in/uploads/wosujiwipubojuzo.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/571594408.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2e5bd573c---pakafavajil.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396f0fae6af---darabevuzavip.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/55861959983.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/50043814248.pdfIn PDF document text
    • http://telecycling.org/files/file/xixifarem.pdfIn PDF document text
    • http://tabletopad.com/images/file/vumoxavivegesomisu.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/zakoripewa.pdfIn PDF document text
    • http://partiaweb.com/upload/files/finuzupekiwutotapofor.pdfIn PDF document text
    • http://teresachild.com/upload/files/24429952530.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/61724328040.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_off0000e1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A1 10736 bytes
SHA-256: 9fa65fd521b60343b0117f656b8779bd9599db04b845584d68e08d9593e6f959
font_01_sfnt_off0000fa7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7B 17048 bytes
SHA-256: 73b6d57b347061feaa5954011f5f11e4097156fdfba943ecc52deb742c1e4a44
font_02_sfnt_off000126c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.