Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d74b6abc1236dc…

MALICIOUS

PDF

122.0 KB Created: 2021-02-15 19:29:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7bc2a3d34e784c17960478be021aaca3 SHA-1: 724d7f66a502c48c7ba0b7d31951f9a4608591e8 SHA-256: 86d74b6abc1236dc54a193275ea3fd226070e3cd39dce1f504beccc9d9565676
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'jacksth.ru', which is likely used to deliver a secondary payload or redirect the user to a phishing site. The PDF structure itself is also flagged for duplicate object bodies, a common obfuscation technique in malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=will+yeast+ferment+sucrose
    • https://static.s123-cdn-static.com/uploads/4475209/normal_60090b34270f3.pdf
    • https://cdn-cms.f-static.net/uploads/4383800/normal_600f1a112c9da.pdf
    • http://yatvoyya.fun/duloju8s3w.pdf
    • https://static.s123-cdn-static.com/uploads/4475212/normal_5fe1bc5e509fd.pdf
    • http://sapelijamot.22web.org/sentencing_guidelines_council_breach_of_restraining_order.pdf
    • http://playmarket-online.com/english_to_afrikaans_translation_downloade12uq.pdf
    • https://cdn-cms.f-static.net/uploads/4500674/normal_6012476924227.pdf
    • https://cdn.sqhk.co/kugugofawaz/euhgRCE/driving_school_2018_mod_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4409098/normal_5fd9a1836d2c8.pdf
    • https://cdn-cms.f-static.net/uploads/4446401/normal_601f6a8323e5f.pdf
    • https://static.s123-cdn-static.com/uploads/4413110/normal_5fc6b911ced4f.pdf
    • http://amaryllis.space/72309061505mojx5.pdf
    • https://cdn.sqhk.co/puroneruk/iewu8PZ/monument_valley_2_soundtrack.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xajejosiwoja.epizy.com/71543521954.pdf
    • http://gixisenusadat.rf.gd/adblock_block_ads_apk.pdf
    • http://judafigot.rf.gd/besetipisigode.pdf
    • http://tosememab.rf.gd/yakuza_kiwami_all_substories_guide.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019ae5.bin
2de610dee304b5d2d1ac816c334128ee588d76a5ea215c6e6afe2ac45aa72d22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19AE5 5144 bytes
font_01_sfnt_off0001ac64.bin
18c017a558e910fc403a7c80f10e79a1e5b8e0c20aa0f0493e6cb63c8f6c6935		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC64 15268 bytes

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