Malicious PDF — malware analysis report

Static analysis result for SHA-256 139a5a4244be5dea…

MALICIOUS

PDF

77.9 KB Created: 2021-03-13 12:55:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c810ed2f61aab3a0366e2e890c316fd9 SHA-1: 88faf62336f39423694a58211065a72011ce66b4 SHA-256: 139a5a4244be5dea51d8c3ca10e653207d3ec72a595086bb13b6a53502115f4e
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are dynamically generated and point to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and numerous external links are indicative of a phishing or SEO spam campaign designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=stihl+023+chainsaw+service+manual
    • https://vebilikowuti.weebly.com/uploads/1/3/2/7/132740371/9839003.pdf
    • http://resipowepo.getenjoyment.net/jamaxugibogeposisuge.pdf
    • https://vixezijimike.weebly.com/uploads/1/3/5/9/135993975/80c3b61e98.pdf
    • https://vaxuvalifavuvap.weebly.com/uploads/1/3/4/4/134484212/5bb0c.pdf
    • http://terugate.mypressonline.com/97884535513.pdf
    • http://www-sfr-fr-monespace.com/zubofalinevezuhfgn9.pdf
    • https://xopapirepukonut.weebly.com/uploads/1/3/6/0/136053795/1f935e10.pdf
    • https://wapubepedud.weebly.com/uploads/1/3/1/4/131455956/butowup-losubom-kozuzi.pdf
    • https://dolafevofi.weebly.com/uploads/1/3/5/3/135330218/9591541.pdf
    • https://cdn-cms.f-static.net/uploads/4476302/normal_6042f450e793e.pdf
    • https://cdn-cms.f-static.net/uploads/4393018/normal_602ffaab37c2f.pdf
    • https://cdn-cms.f-static.net/uploads/4367951/normal_604621a26c20b.pdf
    • https://static.s123-cdn-static.com/uploads/4476282/normal_5fe2f7d6e83b3.pdf
    • http://kirudikegopoded.sportsontheweb.net/for_the_love_of_act_science.pdf
    • http://roman-holidays.shop/36937338265009lx.pdf
    • https://static.s123-cdn-static.com/uploads/4474746/normal_5fcf461782155.pdf
    • http://tebeririz.scienceontheweb.net/how_to_find_out_driver_license_status.pdf
    • https://texifafotolatip.weebly.com/uploads/1/3/4/7/134764930/4610971.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_398340fe7fb24a29a7cc4cf08853b843.pdf?index=true
    • http://gupatevefojip.myartsonline.com/70-743_exam_questions.pdf
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_decc0b718f6d4a05adea756c46234685.pdf?index=true
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_9cb8b17559ec455d9694d8f75a00e746.pdf?index=true
    • https://f6b99bba-f064-431f-ab68-6eacb91b2703.filesusr.com/ugd/35e1ce_fa3f0960b6f045f29f36ba5074cca05c.pdf?index=true
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_df280881396349b3a1bd013cc5c52f44.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_off0000f170.bin
c4a5cbb65952d8932f9e3e07aba7b60789c4ba4e2090f1a1d4884be4d8c42a60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF170 5732 bytes
font_01_sfnt_off000104e2.bin
524e71dbe66a100ab13882b8986e0037db6309cb8f7d8c543362af18a7ff2cf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104E2 10864 bytes

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