Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a3b607d8c96d0ee…

MALICIOUS

PDF

85.1 KB Created: 2021-09-17 10:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 194e4b9b34f0ac2982fb4cb4ffd62365 SHA-1: ffba6b713e598f19c0c5cad1233c0dcd2a38ca64 SHA-256: 2a3b607d8c96d0ee001b771b9ae044c1448ed52d35f108dac903eecd41515ecd
146 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs, many of which are part of a link farm hosted on potentially disposable domains, suggesting a phishing or credential harvesting operation. The presence of a QR code lure heuristic further supports a phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.c-l-r-p.com/admin/ckfinder/userfiles/files/91183830881.pdf In PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/darawelenipinezazar.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/fusetejemivizerinerodulo.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/dupasu.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/51944337926.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/97449772178.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/b79cb7273744ea5e5ac0b979b4bc3ebf/79383620103.pdfIn PDF document text
    • http://www.moyekolodin.com/files/6168194765.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/26202629337.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/domakonem.pdfIn PDF document text
    • http://awards.nl/img/cms/file/mazewubugojikavuxejuvirig.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/kivegezumiguwotigixinetaj.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/zasokijovedozapukumit.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bd97eee12---46721554986.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/gapuzaximixeg.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/jogafiralatebupinatipijug.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/fewumimeriwivudutefi.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/35720249277.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/3631317013.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/jepikibeke.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/milebilowipa.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/gakumegejulufesefu.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/dizamiriloferudivobe.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/fuvovonosikenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+get+deleted+whatsapp+messages+back+on+androidPDF 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_off0000e4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F0 11268 bytes
SHA-256: 919c398a471c008451547006815dabca76cc7989204a89d96b4c596866ea10bc
font_01_sfnt_off0000fec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DB 18296 bytes
SHA-256: cecf14a7746c91e0fe8cb88db0eff81bc935e9b58f2b79c831e6e8a9d6168701