Malicious PDF — malware analysis report

Static analysis result for SHA-256 b282e3011870d7a1…

MALICIOUS

PDF

79.5 KB Created: 2021-09-15 17:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9fd1c4e177ad75782da98e34c0ec69c1 SHA-1: a7ac0c73849795a76a653b0617ff736faed02738 SHA-256: b282e3011870d7a1322fc59811252864457d643341d24ceb0ed336250841182d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself is also flagged for containing duplicate objects, a common obfuscation technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9714

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://nomylo.ru/uplcv?utm_term=harry+potter+and+the+prisoner+of+azkaban+extended+version+full+movie PDF link annotation
    • https://justforjetscatering.com/userfiles/image/files/90405057567.pdfIn PDF document text
    • http://etkenkalip.com/files/82324996989.pdfIn PDF document text
    • https://onecre.com/images/content/files/fenipepijinatojoz.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/tebifexagevaxudovagopo.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/pudidipe.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361f6549fe7---dowuvijunomupumifis.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/82113622458.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/wisakasigupu.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/rijukuzobakulafi.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/werokokaxupaxutaw.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/88885403580.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/gotakuxeguremidazadilin.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/21414979526.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/gavukuzu.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/e245b1d1b869d924c5030b167e3db5df/nifip.pdfIn PDF document text
    • http://195exim.com/datas/files/puvopa.pdfIn PDF document text
    • http://hongdacable.com/d/files/84023844194.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/31707711788.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/75513230263.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/58322980582.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/94899777899.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/dixirajagotati.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/78893695258.pdfIn PDF document text
    • http://nincity.de/inline/file/64323813315.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/xafuzesa.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/3038316348.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/zaxikalixaretozaka.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://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_off0000d33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33E 17712 bytes
SHA-256: 77cfb813302ee15cc295371666973fd7bbd36157a13607df62985ce2ea2e4738
font_01_sfnt_off00010153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10153 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001196a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196A 11428 bytes
SHA-256: eab0a1d363ab14a21ead4f2398cfb558c849e3954d8b80969142a55e02046f06