Malicious PDF — malware analysis report

Static analysis result for SHA-256 a95957365d8f71b1…

MALICIOUS

PDF

75.5 KB Created: 2021-09-21 00:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 32e99ed335dc73c7faab302804ccba36 SHA-1: fee4171a0dce8014826147d2d15ed7ba7ca67458 SHA-256: a95957365d8f71b1d29dab50bbc2e5c1ec9d8f25ee2580bf8049be6f65fbab5a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to disposable hosting or redirectors, suggesting a phishing or scam lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on potentially untrusted domains. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection as a 'Pdf.Phishing.Trojan' strongly suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://pistant.ru/uplcv?utm_term=what+is+my+lock+screen+password PDF link annotation
    • http://esenkardeslerinsaat.com/resimlerfiles/lorawi.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/99393337834.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/95416772865.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/kokibirojodufopibotased.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/wivivakogaxura.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/navukoxawegikapiz.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148cf055b3c7---41146370756.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/40694709872.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/wepemewoxoxeviroz.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/6722025708.pdfIn PDF document text
    • http://sireny.net/share/files/16952314445.pdfIn PDF document text
    • https://lerivagedesmilleetangs.com/caningest/images/file/diwuduvowopeg.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/bukenopemutakexerojop.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/84961867995.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/410514836147c8f75c359.pdfIn PDF document text
    • https://penal-garazh.ru/files/36090519387.pdfIn PDF document text
    • http://air-con.ru/upload/files/gugomigaxavomonaja.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/lizisexagobudavegiwonize.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/59196238329.pdfIn PDF document text
    • https://hoalavender.net/upload/files/92431436845.pdfIn PDF document text
    • http://dezis.ru/uploads/files/gipupipuduzexiworevamidin.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109060634249391.pdfIn PDF document text
    • http://only-svet.ru/upload/files/nozitixawumirafepo.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137b13a26b09---jawavagamixipi.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/42845423243.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/kabezirudakazazerilijup.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_off0000bfac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAC 11064 bytes
SHA-256: 729cf46271ec6919b723ebbbb6e1145d0537f1b23e4124730da78e3ab2d68d4a
font_01_sfnt_off0000d95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16C 18268 bytes
SHA-256: 85172f2ebfd56820e15fdd40975f0deefdb4c1540cb20b8888717624c66d842a