Malicious PDF — malware analysis report

Static analysis result for SHA-256 f68a9367ee16356a…

MALICIOUS

PDF

70.3 KB Created: 2021-09-30 15:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0af45900331124360b944e3957d93c45 SHA-1: 20fdfc895005431199ef942b3494b35dccef3344 SHA-256: f68a9367ee16356a449cd8d387e24f80470f3efa686b6855fe88c9e679f52ac6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics suggest potential for embedded malicious JavaScript or exploitation of PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nrgmedia.hu/files/file/27643812626.pdf In PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f45032a384---19915812041.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/susomowu.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/36851954000.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/49300422228.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/75477718283.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/1880189763.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/45827339790.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/biropedejuzolusozamabenek.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/34639957701.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/e961111f805ab229d37eef53fc205086/89274690684.pdfIn PDF document text
    • http://inphilong.com/upload/files/wubojad.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/xixuxezu.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/40524140399.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/kagoxobodova.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/74561021687.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210919050726.pdfIn PDF document text
    • http://apcmagon.com/userfiles/zufigetisezaxubopesegiwad.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/81398972483.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/ralowebususowekedavuzekax.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/90739223292.pdfIn PDF document text
    • https://mytshirtcreator.com/app/webroot/files/file/notada.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/pazepimisuvu.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/zevosixuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=mutilate+a+doll+2+download+chromebookPDF 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_off0000b1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F6 15016 bytes
SHA-256: 6eb53dc0288b96f479559eb8789af16a9fa16ec2c16171e393583c84d46740b0
font_01_sfnt_off0000d7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BC 11000 bytes
SHA-256: 5fecce2a96fb5ddd7cc3d2984c2f4d433ddec452a6cfee4d962d6b64266e9f15
font_02_sfnt_off0000f126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF126 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1