Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2eb5bdec43224c…

MALICIOUS

PDF

80.0 KB Created: 2021-04-03 14:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2fc47575c53b28067268905070f7f09 SHA-1: 966ee236a88f949d4e0f6f085278a6ca7e1418d9 SHA-256: 4a2eb5bdec43224c6946e2fe9b139355d94cd108d401d4375c9b16a4aa889ea3
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, a common tactic for phishing or distributing further malware. The heuristic PDF_SEO_LINK_FARM indicates a mass of external links, and the ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of external links points towards a likely download or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://soxebez.ru/wix?keyword=correlation+and+causation+worksheet
    • http://dololebajug.scienceontheweb.net/tipos_de_alexitimia.pdf
    • https://cdn-cms.f-static.net/uploads/4422893/normal_601fb72c4d98a.pdf
    • http://milansit.space/wagner_paint_sprayer_plus_manual15hrs.pdf
    • https://cdn-cms.f-static.net/uploads/4475582/normal_5fe7efa276c59.pdf
    • https://dotepeguga.weebly.com/uploads/1/3/4/6/134684910/5682905.pdf
    • https://cdn-cms.f-static.net/uploads/4469828/normal_606303b75a1f4.pdf
    • http://axecheat8.xyz/lomezelexefi5wu7h.pdf
    • https://static.s123-cdn-static.com/uploads/4455884/normal_5fc96c0916589.pdf
    • http://vorakumezaxof.mygamesonline.org/nouns_verbs_adjectives_adverbs_worksheet.pdf
    • http://sodahq.pro/is_breaking_dawn_part_2_on_netflixp60pz.pdf
    • https://cdn-cms.f-static.net/uploads/4383561/normal_5fe9b0a30929d.pdf
    • https://static.s123-cdn-static.com/uploads/4389095/normal_5fcd73baa3d8d.pdf
    • https://kuwupixunipava.weebly.com/uploads/1/3/3/9/133986845/50619114e470797.pdf
    • https://cdn-cms.f-static.net/uploads/4446038/normal_605d6e92cb962.pdf
    • https://static.s123-cdn-static.com/uploads/4476756/normal_5fe2ea19a8c73.pdf
    • https://gubijebe.weebly.com/uploads/1/3/1/4/131483267/puvumilafetasepike.pdf
    • http://bidibuxodad.22web.org/advanced_construction_materials.pdf
    • https://raxelapanaf.weebly.com/uploads/1/3/4/7/134746791/34d745.pdf
    • http://jitutirujemi.22web.org/65003943898.pdf
    • https://ruxikikigiligex.weebly.com/uploads/1/3/4/3/134347308/wefugifuzafi.pdf
    • https://cdn-cms.f-static.net/uploads/4446289/normal_5fd1ba485cab9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sixategajufob.epizy.com/list_of_excel_formulas_and_functions.pdf
    • http://sedunadilame.rf.gd/organizational_buying_behavior.pdf
    • http://rufukapujame.epizy.com/gevisisaxegunulenewapal.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f311.bin
2a6aca35a944915af358ea2cf45fa1c36affec7ba0cd18abe7dcc1f9d7f6d376		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF311 5088 bytes
font_01_sfnt_off0001045c.bin
fcfb8f0e55ad9df5a1ad0726378e3a06894f11344b8aecece3a66ee94f149217		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1045C 2252 bytes
font_02_sfnt_off00010dc2.bin
734fe91559b3504e16105653a5e8019922c87d1a8edfe935df1250301e342738		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC2 10616 bytes

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