Malicious PDF — malware analysis report

Static analysis result for SHA-256 f895db796aa9860b…

MALICIOUS

PDF

69.1 KB Created: 2021-09-28 03:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bdf5edf65df64baabaddb0d21c05ddc7 SHA-1: 152543fac8a0c25b62e5325a30cec690c94267cb SHA-256: f895db796aa9860be6cf59f592d4af87d9a79f36a56caccb78d35e510845ca55
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous unknown PDF URLs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of distinct hosts, suggesting an attempt to distribute or redirect to malicious content. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure points towards a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://projectmine.hu/ckfinder/userfiles/files/mozufurasezafusixima.pdf In PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/61530222359.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/zewefewolodaf.pdfIn PDF document text
    • http://efcosmetic.com/uploadfile/files/bifuxoxutubodexalotiw.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/garemuganawoli.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/jatapig.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/sogizujuk.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/pasapuziwevijowunozosotu.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/fuwuvogaxufofodolepubiru.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/wobatujajowutibemepuz.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/918884741.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/bevalejavoxexinuj.pdfIn PDF document text
    • http://iucecb.com/files/file/seravabiviluraramilor.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/giweva.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/gomovuwiwo.pdfIn PDF document text
    • http://sjanzee.nl/file/91238336353.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/fonesubuvudawe.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/wakuxofematovi.pdfIn PDF document text
    • https://fivetc.net/uploads/files/37054450523.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/96835417639.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/79748425849.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/rimamabajobapori.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/jazetokaluvadak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=dr+who+planetPDF 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_off0000b19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19E 15416 bytes
SHA-256: 10b667302207ee3952640c03ecef2562547939f18b8789749e4ed8e29b002ac7
font_01_sfnt_off0000d81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF034 10176 bytes
SHA-256: 301d43159257011c8c89b58aee3b46702539cea819c91381b85c7dbd74d472a8