Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b74032f2dbe4506…

MALICIOUS

PDF

83.2 KB Created: 2021-09-14 13:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4e4b281eeb7848fa711e818b89b504bb SHA-1: d9762bacffa3ac63556e7ea0cb77f759b13287f6 SHA-256: 0b74032f2dbe4506de6e9dfe75ad87c33164670b55d377c2ecfea53c28144073
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample was flagged by ML and ClamAV as malicious, with ClamAV identifying it as a phishing trojan. Heuristics indicate the PDF acts as a link farm on disposable hosting, pointing to numerous other PDF files. The primary malicious URL identified is http://sarljarry.fr/userfiles/file/lurowinonolowidepelemisu.pdf, which is likely part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://sarljarry.fr/userfiles/file/lurowinonolowidepelemisu.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0250cb5ca---fugub.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/ramojubupagi.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/52461488690.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/migamenisabonaneg.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/bimabigumun.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/lugopileremunufevuvidis.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/32462776209.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/92921342791.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/rosuf.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/87094949649.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/wolupabuzunodofarebike.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/45295480350.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/60893055604.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/26834522616.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3a6747419---99855450415.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///jujamikerisesanun.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/julowiwamaw.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/94814401181.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/wudimopiwawevimoted.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/32880648479.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/viveluluwumepodekaluvera.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/99121556156.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=swift+keyboard+themesPDF 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_off0000db39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34B 19264 bytes
SHA-256: b01d8b19e4695f8ae9f2673129fa8e9dfc9a30456eb7edfd37a67e4736af6c7d
font_02_sfnt_off00012643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12643 10976 bytes
SHA-256: b3cb78d4d96374876c75e8847b6b272b815ffde5f67fe5961e7b6d83124282b5