Malicious PDF — malware analysis report

Static analysis result for SHA-256 976f9da38b481e37…

MALICIOUS

PDF

69.4 KB Created: 2021-09-30 19:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ef7b04b4174d7ea695fa55da8d878da1 SHA-1: 303ebfe4a5299cc3320e352ed50bd6ed19f296f1 SHA-256: 976f9da38b481e373ec70a92932571587107006b43dbef8527af4eb617b0b275
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF is identified as an image-only document designed as a phishing lure, indicated by the PDF_IMAGE_LURE heuristic. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm used to distribute malicious content. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a dropper for further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://streathamtaxi.com/survey/userfiles/files/77390578493.pdf In PDF document text
    • http://swotaweb.com/img/upload/file/68185531619.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/14276747114.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202192073679703.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/guvinuborakonodabuveb.pdfIn PDF document text
    • https://theipbuzz.com/images/file/40244920079.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/34636141645.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/47994647810.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/xebudap.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/moremoriwalaje.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/45165526647.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/68892924749.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/varegutijawozowewukomu.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/50553471402.pdfIn PDF document text
    • http://qigong.ru/userfiles/file/74004453848.pdfIn PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/55238602136.pdfIn PDF document text
    • http://freeorden.com/media/file/sibewevodufobelaz.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/zerejus.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/72650254323.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/4126373473.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/ganapedodigi.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/jodozonib.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/zomefafebojevovubaxu.pdfIn PDF document text
    • http://tlcjty.cn/userfiles/aa/file///gefuw.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/30497b603904b24fc85f1af1943ce01a/75860757512.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=stickman+1+2+3+4+players+apkPDF 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_off0000b20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1E 14100 bytes
SHA-256: cf1476759ddcd070dd39944e8a53ca52995ef02cd4a0d0e6ab026a5844ee04c2
font_02_sfnt_off0000ed2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2E 11120 bytes
SHA-256: 6c02cc5f2b2febbca5a722c094dd69a241a3a3e67253e01f17ccf6990ebd0199