Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b1045846cb25d0…

MALICIOUS

PDF

79.2 KB Created: 2021-09-12 12:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 94ce2b8fb86f09010edc325e8880f440 SHA-1: 89c144b971b7a3c41bf454a7becb443199957a37 SHA-256: f2b1045846cb25d02c6efe295a871a1fdd19afb06722e2ca5290330b03a76682
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to unknown or potentially malicious domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://faresaldabbous.com/uploads/files/nowawe.pdf In PDF document text
    • https://resonanceacteurs.nl/userfiles/file/4505949164.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/68501103871.pdfIn PDF document text
    • https://everestart.com/images/stories/file/zadajesurerawasivizezadu.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/fibevijolapopodulejes.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090709220454008.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/vupopixiwipifaju.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132b30157d71---texadisufawa.pdfIn PDF document text
    • http://nktrading.qa/file/files/46475419598.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/78568629307.pdfIn PDF document text
    • https://greenways.at/userfiles/file/gusuzefujakidunazola.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/3640319287.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/fibododazes.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/japitijofuzebujot.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/83093873284.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/48651977110.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210906202152.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/45151794438.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/86132532454.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/retodepotomipoguvomexe.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/9680668587.pdfIn PDF document text
    • https://areicon.com/images/file/zevelido.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/19421851467.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376d8f91288---82625820159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=stickman+falling+modPDF 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_off0000cf30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF30 17952 bytes
SHA-256: 54e721bc905738b4289e909a25da35e140f4c4a49a3b5f873150876f9443053c
font_01_sfnt_off0000fda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BE 10584 bytes
SHA-256: 71d93e299a42cca38bd94655998da4f6849349d4ce833e474767c6d05a959e21