Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa0874e9eea670f0…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 16:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8d743dee8868b19d68b3b877f77c64f1 SHA-1: 542ae8556fddf2afe69ea3984a7478a27bbd60b0 SHA-256: fa0874e9eea670f030d54e8e274afbe91a7f222663411673fcf94b1c9ca8d721
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm with numerous disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138e8e0285d1---novawajodelepotojipaxijug.pdf In PDF document text
    • http://www.smartusb.info/images/library/File/duzagufizogewum.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/78412836703.pdfIn PDF document text
    • http://goldmustang.com/files/files/96721163538.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/17315229189.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/vezizugiborugozi.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/87874464543.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/samilivafotukodasebukopu.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/78933703858.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/kiroxofebutukafut.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/xavuvuzesufapizixa.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/ditifito.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dagufukujerizilo.pdfIn PDF document text
    • http://simonide.org/userfiles/file/90399993570.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/sejumozuxewefamusenijo.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/52522512183.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/zagojufijirageg.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/puxixat.pdfIn PDF document text
    • http://apsons.eu/files/file/23027399620.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/totajiw.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/lawaderojafofupipiwipere.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/40517142201.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/pojuluzapagunibivudab.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/13821997734.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c56f2ac590---1510238444.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=sims+freeplay+apk+mod+iosPDF 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_off0000dc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC09 10740 bytes
SHA-256: ca840c9312749fc61fa8f82f332ea8f55d9051cd037c0277d01037c7d753b89d
font_01_sfnt_off0000f4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC4 17200 bytes
SHA-256: a0cd282c829d328879a7ae0a67427839d5dccf4db89da70f3f9f42df90d3529c