Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b93845997dffb5…

MALICIOUS

PDF

78.8 KB Created: 2021-02-13 17:43:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 1b1f64d1d1904df177d5d9bc63d04d74 SHA-1: 43ce02bb86274726d5bc967ddf0abab1edc46957 SHA-256: a3b93845997dffb5ed6aac696b81f2c36c09333bf3d35fb027767fba0fc293c2
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM' containing 30 external PDF links. The primary URL, 'https://jacksth.ru/123?utm_term=union+vs+confederate+flag', suggests a content-lure strategy. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/123?utm_term=union+vs+confederate+flag PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382192/normal_5fd8d03dea86a.pdfIn PDF document text
    • https://livadasim.weebly.com/uploads/1/3/4/3/134312527/wifawapakaxin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412387/normal_6000d8e3f01f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369164/normal_5fe3f72bb0db7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426677/normal_6017a2e277c38.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478408/normal_600812a75300e.pdfIn PDF document text
    • http://hallhq.xyz/busy_busy_song_djpunjabtn9a7.pdfIn PDF document text
    • http://jsexj.fun/kanadalurawitambscbv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464730/normal_6020cf9fa1f62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408873/normal_6007119be8406.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470028/normal_5ff877b60ae4e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465705/normal_5ff718f1a80e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453907/normal_6018797a8b056.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365628/normal_5ff490eb65d56.pdfIn PDF document text
    • http://fojozefamofu.22web.org/zadaradozuxekeluf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD469 5028 bytes
SHA-256: 7d848fcdc7706b293befc2fa24b32549249e99340a05529aa1cbb0cc52f9ff68
font_01_sfnt_off0000e593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE593 10888 bytes
SHA-256: a784963ec67142a7ab07ecbd664d6dd4bfbc34740dd26d08bcc85edb05e194f2
font_02_sfnt_off00010ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD0 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
font_03_sfnt_off00011ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFD 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

Open this report in the interactive analyzer, or submit your own file for analysis.