Malicious PDF — malware analysis report

Static analysis result for SHA-256 e82b6637da205828…

MALICIOUS

PDF

82.1 KB Created: 2021-09-19 00:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6b5f4cd7c8e833e65dbcc86424055c3d SHA-1: 0aaaf903e3b19b422e5df08bc1a1444ea68effc3 SHA-256: e82b6637da2058288c4f4b9fdbdb8fda401ea4a56e0da2c85e30b7967c976405
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to PDF files on various domains, suggesting a link farm or distribution network. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for SEO manipulation or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://samsunyapi.com/userfiles/files/74808603846.pdf In PDF document text
    • http://jiin-torng.com/uploadfiles/20210911092703.pdfIn PDF document text
    • http://zerosquareonline.com/file/zinajobezowufurinowulupo.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/jenavo.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9d6aecada3b827d12a132a675d7e5fae/vibejiwuregaremek.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/11364746949.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/ditusisopefosebulavadow.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/70944818661.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/40388105302.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/70265409588.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/jagovuxojar.pdfIn PDF document text
    • http://szhlfz.net/upload/xavagalalor.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/bozibupapekivotan.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/kigumuberej.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/62136690712.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/69362346605.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/xufimozizesozupokevivuka.pdfIn PDF document text
    • https://intersat.lv/files/file/kegikovizinux.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/15008715330.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/javajukeju.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/16319428698275455ae3eaa2c291ee.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/joruzutudidonevelivapu.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c1e2ace32---pevidozis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=stickman+master+mod+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_off0000ddf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60E 10796 bytes
SHA-256: efa416effb560476c4163f7667fcaac9d6d5851533bf959a124196e92e66dc09
font_02_sfnt_off00010ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE2 16952 bytes
SHA-256: c30e877c6b5084c997e5c5007471012841589cec62dae4a79150ba98a8c10b03

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