Malicious PDF — malware analysis report

Static analysis result for SHA-256 095c4c53e016923f…

MALICIOUS

PDF

72.7 KB Created: 2021-09-17 18:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 29f7a426e1eefb538307541f7afb947c SHA-1: ae5d79af873b76c132fbeb08cac21414a0d7c37b SHA-256: 095c4c53e016923f4ec0d231c5e9b2e439eba3233a1d973d7086369ebdc6e58b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to PDF files hosted on various domains, suggesting a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or spread malicious links across disposable domains. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://alhurwallpaper.com/Files/files/satuvumewekibajesukeram.pdf In PDF document text
    • https://lotte-ppta.com/beta/assets/file/xudadeluxoremomapi.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/tekirapigum.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0033037f7---52709903080.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/jerosog.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/sigaxodixe.pdfIn PDF document text
    • http://xprchemical.com/upload/files/wubozubularubusu.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/dadivasitisu.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/maxidu.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/22229841680.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/xinarexunubafodemo.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/femasubisoxelulutomi.pdfIn PDF document text
    • http://espokebar.com/uploads/files/75517742015.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/93383288640.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/a7c5ce71e2f399c48704c3743ad906aa/mekenotogobosofomesuv.pdfIn PDF document text
    • http://hzqzg.com/d/files/64920071544.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/pobovitovatiz.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/wutotiduxubejubirufudofo.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/daginera.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210904_172605.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/zerunuwiwuledox.pdfIn PDF document text
    • https://adikkedua.com/contents/files/53546131185.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/65304801026.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202196858388865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=increasing+energy+of+electromagnetic+spectrumPDF 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_off0000ba12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA12 10988 bytes
SHA-256: 530fd370aff4d0c609ab25b1a17b94ad602c226305e7370641a9061062abdad1
font_01_sfnt_off0000d3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB2 16008 bytes
SHA-256: 37f2960c14fb8dd29f0d630a6fd9ee70296561f40dcca83d9cf002b4d6457fa8