Malicious PDF — malware analysis report

Static analysis result for SHA-256 912862c9eeae54c8…

MALICIOUS

PDF

82.6 KB Created: 2021-09-20 02:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c67076fe53848f478ef83c583c94b7d7 SHA-1: 2a69f36538771659456bb567b2e7272e59c6c7b7 SHA-256: 912862c9eeae54c800c8a673c9cbf1836a1fc0af9834ad1fc2c08399afef7dba
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on potentially disposable domains and appear to be part of a link farm. The primary function seems to be directing users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.ocptecnology.com/admin/uploaded/fck/file/71414208158.pdf In PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/76991d089ad8d7ea5d4bf715fa4f337e/81041787816.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/76247328476.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/98302842651.pdfIn PDF document text
    • http://iviltra.lt/images/files/97626676629.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/gujezitumujasejonetosi.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/fimewumimafulojivep.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/88776324915.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/tusabesaka.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/bolosagutovad.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/mitasose.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/zoguzowilekape.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/fokinivugasofogozupugev.pdfIn PDF document text
    • http://elpijisystem.com/file/37184324284.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/d07d85fdb7b9453e9b99db5fc5fd0c23/38086776547.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021091319324383.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/zorevotezukuguwaw.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/26299343603.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/29243518798.pdfIn PDF document text
    • https://servicepapik.ro/files/jixuz.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/zuzefi.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/70006946466.pdfIn PDF document text
    • http://erdbau-rauch.at/buwakeruk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=autocad+2013+tutorial+pdfPDF 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_off0000d85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF072 10756 bytes
SHA-256: a082c0d8011a6c414dfc3226c28cfad9dfa103475e78e57cd532a8ebaea93a6a
font_02_sfnt_off0001096b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096B 18956 bytes
SHA-256: ad8d13a70fcf1bf4d4b38be63a3514df506d529d3fe87e3c63bb649f18897ce8

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