Malicious PDF — malware analysis report

Static analysis result for SHA-256 640f572de9ab4eaf…

MALICIOUS

PDF

89.8 KB Created: 2021-09-16 22:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 441807dd30d7b3a49666186cba5e08be SHA-1: f72fa2d17b6d793287a34b7c774b49bf48807430 SHA-256: 640f572de9ab4eafd9d2918244d7c7d6b032cf3ccf70c28cca303efaca09a939
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external sites, indicating it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users through a network of disposable domains, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://medvor.ru/uplcv?utm_term=seven+types+of+ambiguity+william+empson+pdf PDF link annotation
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/57325703i4i5gpf52t9cjpoala/34941099130.pdfIn PDF document text
    • http://one9five.com/userfiles/files/xavarin.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/81553053687.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/vesazubot.pdfIn PDF document text
    • https://ratodua.com/contents/files/tivufekozugizuj.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/vagatizevisofikaxavixasa.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/kuxukuxukotake.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/valelulepafemi.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210916_187C63C1D50E8DA3.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/78480839617.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9ec2e2ef6---jovasupekoregowuxa.pdfIn PDF document text
    • http://arsvet.ru/img/upload/wakuban.pdfIn PDF document text
    • https://triosms.com/userfiles/file/70365628273.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/pudekosevine.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/sujuxelukegu.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/27084412958.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/zurovividexatu.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/83919019095.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/70456607822.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/72373530551.pdfIn PDF document text
    • http://dc-3ed4d7413bdb.prshots.de/uploads/userfiles/1630665070/files/kewokonewek.pdfIn PDF document text
    • https://betsin.org/userfiles/files/kafanekixisota.pdfIn PDF document text
    • 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_off0000f649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF649 11320 bytes
SHA-256: 33806729786978ee0d4b46a9429fbea15f87a28083f687a2ddbb491c5ea33273
font_01_sfnt_off0001108b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108B 18692 bytes
SHA-256: f0ea866949e6c0a2b4f2cd6750f085fa503dd41422f07f7c7d7ea373d7aa4d12
font_02_sfnt_off0001412a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1412A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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