Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d96c977484adffc…

MALICIOUS

PDF

72.3 KB Created: 2021-09-26 12:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 98f6de5c6b769fb18c11ec4a6dd3b927 SHA-1: ad7dbabbd4438490555b7566f86adcd761e88cb5 SHA-256: 3d96c977484adffc54978289ee6f969aae0cfab2c5e9304e8a76e58dba249965
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to the document acting as a link farm, directing users to numerous distinct hosts. The presence of many embedded URLs, some pointing to potentially disposable domains, reinforces the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://dglytbt.com/upfolder/e/files/20210902122019.pdf In PDF document text
    • https://verticala.ro/images/userfiles/sexevirebifadoron.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/47949015532.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/fipazugezapisinebusulej.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/kifagerapugumidedewo.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/49010525748.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/roruwezuzamod.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/mowopulivamev.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/33103364258.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/vasagikaxajuxazizewed.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/18183424558.pdfIn PDF document text
    • http://farmina.ru/uploads/files/fepinodaferunetax.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/46091521317.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/48879415886.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/53864704310.pdfIn PDF document text
    • http://elsped.hu/files/file/82459138147.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/70712607744.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/darudotowavesitoto.pdfIn PDF document text
    • http://shinhwacar.com/userData/board/file/xowalizisima.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210910003634.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/xurasoxutevifejobidux.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/46359589275.pdfIn PDF document text
    • http://altinay-law.com/images/file/jivagatolajezevumematom.pdfIn PDF document text
    • http://ombs.ru/uploads/files/87156089687.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/62212959760.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109172050154024.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210905_8F9F23B093522C49.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/jerojuwivamex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=thoptv+apk+latest+version+downloadPDF 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_off0000b735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF47 16768 bytes
SHA-256: 633ef7361a9cb1e7e2bd9f75e8485b1a1cf709d070e644f900e72d24b3abecb2
font_02_sfnt_off0000fa4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4F 10696 bytes
SHA-256: 43a0074b4c5e433849dedca6db0e99b44670404972f4549a346e6e5a7238181a