Malicious PDF — malware analysis report

Static analysis result for SHA-256 59a66431fb8e8c72…

MALICIOUS

PDF

78.1 KB Created: 2021-03-28 05:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9bf03fabf91ac384615b4ca2325df074 SHA-1: 962e292fac0847ebb750e7e5e0b44ce0f1353198 SHA-256: 59a66431fb8e8c7253602d889b22c9f2aaed8d3d782c57feb50f776467bdf796
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, many of which point to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic and ClamAV detection. The document body, though heavily obfuscated, contains references to 'modern combat 3 apk data', suggesting a lure for potentially pirated software or game-related content. The primary attack pattern involves directing users to external sites, which could host further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://nipisod.ru/wix?keyword=modern+combat+3+apk+data+1.1.7g
    • http://vejobazure.22web.org/what_careers_are_in_electrical_engineering.pdf
    • https://nepuvojikonutoz.weebly.com/uploads/1/3/4/6/134677469/3667470.pdf
    • https://robaralimojo.weebly.com/uploads/1/3/0/8/130814718/ef3975fb.pdf
    • https://vademakab.weebly.com/uploads/1/3/1/3/131380849/2784051.pdf
    • http://lemujivowukita.22web.org/kuvisejumaxeme.pdf
    • https://bilujadaju.weebly.com/uploads/1/3/4/7/134772480/fosifutotufowaga.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_e9730a6b085448a1b2d8724083baaca0.pdf?index=true
    • https://s3.amazonaws.com/xakapudakadu/attendance_allowance_claim_form_notes.pdf
    • https://9e2901ea-5d25-41a5-867c-54d0774c6e48.filesusr.com/ugd/4d0f37_3abee2cb7675427984d67d8be130526f.pdf?index=true
    • https://235a1a37-2bc9-4d3b-8f1d-d3952ad9fba8.filesusr.com/ugd/3111f7_19a05b68e17f47b8b6877c6053b1cd17.pdf?index=true
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_5e9033c9d07e419e80daa1b25f652bec.pdf?index=true
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_e85247c78d1240a986b93f39d5d44077.pdf?index=true
    • http://rabuwupitakif.rf.gd/33721620187.pdf
    • http://roxuriwiladubew.rf.gd/31660501117.pdf
    • https://s3.amazonaws.com/tobobowu/22705780233.pdf
    • https://5ccda086-29c7-4024-8a93-689df1f3b89c.filesusr.com/ugd/ed8107_1f46eb5a48e542b383d7f60befeee56b.pdf?index=true
    • https://def05634-b969-4265-beeb-1e7d695e9a44.filesusr.com/ugd/6865ce_b125806ea158434984f4fe940f8d2efa.pdf?index=true
    • https://28a90398-13b1-4b58-b54c-ed045a6bddf2.filesusr.com/ugd/7e9e1f_84788bfa26a443ceb885b47537ae4213.pdf?index=true
    • http://nilavoforejexo.rf.gd/poxutofebemibexixo.pdf
    • https://cb705b04-a904-4f11-a6d0-9d7e2b1ae5cb.filesusr.com/ugd/53498d_edb5227abff047f4b0b8f5e444292a94.pdf?index=true
    • https://s3.amazonaws.com/kabisebax/21_day_sugar_detox_lunch_ideas.pdf
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_6e178e2eb0c348199794bc893f00f11b.pdf?index=true
    • 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_off0000f1de.bin
502c78139fb9a616b941816526086a2cd25179d549f8ce2d99422a053f2d2ae2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DE 5720 bytes
font_01_sfnt_off0001055c.bin
7cd547d0d4c6cb087664c37982b3396ebec5f5aa6caa0ffdb347feaa362b23f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1055C 10940 bytes

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