Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f93b5bd7faf5ec…

MALICIOUS

PDF

69.0 KB Created: 2021-10-02 20:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7d043fb9dff8b4607ed416229cf097ed SHA-1: 5ca8176a7ecfcef415c508232256d4ad12990f0e SHA-256: a5f93b5bd7faf5ec1e5c4288e5d66c1d0fd6cb94d77fe42dc08245c643efdb0d
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4c84048079b4ccf70dc770fa77bc7f37/gubufenisirafuzikekami.pdf In PDF document text
    • https://eclearusa.com/images/file/ponagevizijuxinumeg.pdfIn PDF document text
    • https://ismart99.net/upload/files/robojukulimoxub.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/guwefo.pdfIn PDF document text
    • http://idroter.org/userfiles/files/68353788614.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/2303309642.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/79556993682.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/xomazowilinamafajokosof.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109261710333787.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/91255021655.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/puwobarijireva.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/80353852479.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/56865797945.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/93241551473.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/70691391305.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/xugumisonezopemufa.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/xumuni.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/3326052676.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/7468722667.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161541e71cf1e8---faledomusupipizupu.pdfIn PDF document text
    • http://newcityhk.com/userfiles/nipewimovetixegepuw.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/nemarekivosojevigasej.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/4299590400.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/vefojedofezalanopinew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=the+blind+side+drivePDF 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_off0000afab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAB 10132 bytes
SHA-256: 53f89ac5a0f9c985bcd43a2ae80d275355d18f7bb4b9ff584778898422f75b93
font_01_sfnt_off0000c62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC62A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3C 15880 bytes
SHA-256: cc35209499e9855d6d6e8bb40f7ad6a25c4bbecbed8b60e3c82de134e469dc47