Malicious PDF — malware analysis report

Static analysis result for SHA-256 e809e155cabe22c4…

MALICIOUS

PDF

70.2 KB Created: 2021-09-27 04:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ff7af383d2383b33a64d0e80a355d44b SHA-1: f2b603471b5f04f3556968de778a70476e547fdc SHA-256: e809e155cabe22c4dea77f232a98d3fd9de505826d365bb22c8d29ef1e804a75
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, embedding a large number of URLs, many of which point to potentially malicious or unknown domains. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://hoanggiaphatland.com/uploads/image/files/15721310647.pdf In PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/47638884611.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/1240212626.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/52240900996.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/22140010589.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210918053200.pdfIn PDF document text
    • http://danbikoreansj.com/uploads/files/sokox.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/wawesites.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/volitewon.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/nuwigusitaruwirotokibe.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/891717753.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/6364485087.pdfIn PDF document text
    • http://riph.pl/userfiles/file/11880272794.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/51555176058.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/57942710857.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/demulazewopaxenawemadivot.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/52147308899.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/parezinafateb.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/64524733409.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/2438771427.pdfIn PDF document text
    • http://marymo.ru/uploads/files/jomuni.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161318e7e1946c---tejenagebenegafuvumenode.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/4006429572.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/totaduzexav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=ak+47+mod+avakin+life+iphonePDF 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_off0000b1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA04 15552 bytes
SHA-256: cc268d93cfd1f0c1bbdedf45f1803165e627f8cf3366e10c0a5ec4e68f5c29ef
font_02_sfnt_off0000f0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DA 10664 bytes
SHA-256: 02a19d117595ed66db16533e8bbded6a8b0305416f2f104eff9ac489f3df6b39