Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bac36fc51f24890…

MALICIOUS

PDF

150.7 KB Created: 2021-10-05 10:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 66713b972176e8f0e0e3843fa9025086 SHA-1: a11297edb3f0e40ae3e770afa6ce2eda538b41f8 SHA-256: 2bac36fc51f24890e74cecaabe1139bb69b65465a7d5fbb687f05e3e4d0cc2ca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable hosting, and one specifically uses a UTM parameter suggesting tracking for phishing campaigns. The presence of external URIs and the link farm heuristic strongly suggest the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://inwebjor.ru/uplcv?utm_term=the+founder+of+mughal+dynasty+was PDF link annotation
    • http://varvshistoriska.com/file/palinejigalo.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c2a855fd15---78098427365.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1615a963fa8516---xidunive.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/pazarak.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/pesaruludegukunoruridoxel.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/genalowisisonofufexow.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/13960846502.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/mexapadimezakojepejafona.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/baludusevoveliwivakinabi.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/16988172146.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/6518206034.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nebogegilidutok.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/balun.pdfIn PDF document text
    • http://lg-palette.com/upload/files/67269276215.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/56932377461.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/wamejuwarazale.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/39882623623.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/jatine.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/26723599032.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/kudizosajoligazejatupul.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/fuzepodewob.pdfIn PDF document text
    • https://zakazspbwatches.ru/upload/files/15731483680.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/84796153957.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/35016796412.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/99414125273.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_off0001debe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DEBE 23408 bytes
SHA-256: 4c80576d32d3926f320ba80f5197b8c082e1c51f7543bd72cc05ca2df6638efa
font_01_sfnt_off00021b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21B57 10972 bytes
SHA-256: 4f696dc94d01241899d705baa4d76f53c657826d319fed6b5e283c77c858f575
font_02_sfnt_off00023485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23485 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1