Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc1bf48ecd9e503…

MALICIOUS

PDF

85.7 KB Created: 2021-03-22 14:36:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66275b48c4e7487da64fbb08edcedb1c SHA-1: 263ba5ebaf242b96c751e352121f0007b100cda3 SHA-256: 5dc1bf48ecd9e503627d10bdee79daf8b1410e785a29b1ead8a6f974457e4856
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution campaign. It contains a large number of external links, many pointing to potentially malicious domains, suggesting a link farm or SEO abuse tactic. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate an attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/strik?utm_term=el+poder+de+la+oraci%25C3%25B3n+predica
    • https://cdn-cms.f-static.net/uploads/4477369/normal_6057e02798a9d.pdf
    • https://static.s123-cdn-static.com/uploads/4488570/normal_5ffcd26480b72.pdf
    • https://cdn-cms.f-static.net/uploads/4426954/normal_602b2e7cd9bd0.pdf
    • https://static.s123-cdn-static.com/uploads/4480884/normal_5fcc95e38199f.pdf
    • http://tosety.xyz/2001_polaris_sportsman_400_4x4_specs1ug9u.pdf
    • http://lubenoredeji.mypressonline.com/master_forge_smoker_instructions.pdf
    • https://static.s123-cdn-static.com/uploads/4370560/normal_5ff76bbbe6668.pdf
    • http://domavera.ru/gta_5_indir_korsang1cm5.pdf
    • https://static.s123-cdn-static.com/uploads/4417123/normal_5feb5fabeae69.pdf
    • https://static.s123-cdn-static.com/uploads/4495838/normal_600800bed52f7.pdf
    • https://cdn-cms.f-static.net/uploads/4494889/normal_6035324c76d2f.pdf
    • http://yoga-italy.space/shop_irancell_onlineek86p.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zasepo/mozariboj.pdf
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_c519c07ec7674a019961d93850f37738.pdf?index=true
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_2e3d6ec9f13c4e65bc71e4c8a24b94a4.pdf?index=true
    • http://vorisenunajix.myartsonline.com/sectional_chart_airspace_altitudes_msl_or_agl.pdf
    • https://s3.amazonaws.com/rexogeguxosix/tazetuxorefotepekozige.pdf
    • https://s3.amazonaws.com/wuzalugiseto/maps_google_traffic_information.pdf
    • https://s3.amazonaws.com/palevijuj/65068657163.pdf
    • http://sagoralezerelo.onlinewebshop.net/prefix_and_suffix_worksheets_high_school.pdf
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_0db18cbfe52d4131af7672a893281b70.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_off00010fad.bin
d450b97c646017c6d09d517d1ad8801c98d33aedc7a3487e1be52790ca200f35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAD 4980 bytes
font_01_sfnt_off0001206d.bin
3bcc20672e4b3a6fe6c440113eb90b1b4d8c195ea8f41605cec8221e50d73906		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1206D 12192 bytes

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