Malicious PDF — malware analysis report

Static analysis result for SHA-256 be7f96f23cfb6d3a…

MALICIOUS

PDF

72.1 KB Created: 2021-09-14 13:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3e407e807fb78bd9100675d632bac5e1 SHA-1: 96ec9042a97f13a2550b7486fa7eddf009649a84 SHA-256: be7f96f23cfb6d3a53d3627ec95c520aefb0f6be68c7081ceb7e98fa4bcda96f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis revealed it functions as a link farm, embedding numerous URLs that likely lead to phishing sites or malware downloads. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://chcial.ru/uplcv?utm_term=el+fin+de+la+infancia+pdf PDF link annotation
    • http://dungcucaytrong.com/images/files/repubavo.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/70266978591.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/nevixefotezilo.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/23081018063.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/52ac8f.pdfIn PDF document text
    • http://esistore.com/userfiles/file/kinaxesedire.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/58337587313.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/71874065515.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89300548651.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210901_1355A3F3E6ABFEB7.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/bavimofafupipowakupa.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/60462693600.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/puxiferekuwonipizo.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/18202044.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/11326877090.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/77016332826.pdfIn PDF document text
    • http://le383.com/uploads/files/vigagegaxenemosesu.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/1513272590.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/96970905038.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/lanakitemozabopomo.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/31394741800.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/61285729258.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/85648226232.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/dasavotobikipetipafawel.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_off0000b7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D2 10112 bytes
SHA-256: 9f75898d7c2515109d8067ebf45078117256085c2ac63e7b4f680a762616b046
font_01_sfnt_off0000ce57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE57 17720 bytes
SHA-256: 50cd41a7bad401c0a253705016df93dba39809b9035fbb5f92864832385867fc
font_02_sfnt_off0000fa72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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