Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4250028e8c48ed…

MALICIOUS

PDF

79.2 KB Created: 2021-09-19 23:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f56eb0ce6a585a1c7588c78f21613892 SHA-1: a2f5e3220de971bbb87a02648ec8a2d07627dedd SHA-256: ab4250028e8c48ed6d085371004b388dcc4804389e717d7d4b96cd46fb4a5012
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution document. The embedded JavaScript likely facilitates the redirection to malicious sites, as evidenced by the numerous external URLs found, many of which are part of link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=free+cbr+to+pdf+converter PDF link annotation
    • https://satesayap.com/contents/files/basakekonuzafurovaver.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/57634273125.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319b04b05f0---48134138994.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/bamazanusukavo.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/sikimumosof.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/rirupagipuguzixuwupod.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/52681617337.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/21647760111.pdfIn PDF document text
    • http://pi-consulting.ch/download/dekaniju.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff942aa6fa---62957189738.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/16168918306.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/fibonidi.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/97051796886.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/55592409452.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/13060444302.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/mojasem.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/69401007042.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/74786110593.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/42032227511.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/pesufusumikugamop.pdfIn PDF document text
    • http://simoncaulkin.com/images/74713089494.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/28335892361.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_off0000d2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F7 10328 bytes
SHA-256: bc7b15864cfb64a844c207f6284f4b16a344c74231c0641b43bab285343421b5
font_01_sfnt_off0000ea1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1F 17644 bytes
SHA-256: a2402b61e49e016ed055d6a1a26f5f4a06660f17b8880d186c43655384b0d1ec
font_02_sfnt_off000117be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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