Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b47b981f24d3bf3…

MALICIOUS

PDF

81.1 KB Created: 2021-03-11 06:25:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b92a5eb0716191051f787aab47698cc7 SHA-1: b10ed9945851f70d94ea3b9b372555c560b4b60e SHA-256: 6b47b981f24d3bf3fbe657ec5c82444051bd9888e7bce733cab6e0bf6d2df470
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent link, 'https://baarspo.ru/award?keyword=baldur+s+gate+descent+into+avernus+pdf+online', suggests a lure related to game guides, likely intended to deceive users. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://baarspo.ru/award?keyword=baldur+s+gate+descent+into+avernus+pdf+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417024/normal_6034463c5b898.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366964/normal_604743b138a61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367007/normal_5febd21557a6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483854/normal_600601904d713.pdfIn PDF document text
    • https://lidafeli.weebly.com/uploads/1/3/4/6/134683499/6957619.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485450/normal_6047f535cae0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417805/normal_5fea401ad82f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499651/normal_5fd96d6a3a94d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456999/normal_603958c512a2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500183/normal_5fffcce712e9a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490547/normal_5fce7ca84f51e.pdfIn PDF document text
    • https://xowanejizaki.weebly.com/uploads/1/3/1/8/131871556/janojuragumudosizik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/kdigo_guidelines_hyperparathyroidism.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/31144011044.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/listview_using_adapter_in_android.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/best_box_design_software_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/mukadma_chalega_yaro_aaj_mohabbat_ka.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4B 5432 bytes
SHA-256: d15c9f8c29a38c9e1de16394f5098d2a40dc768a82600beaaca8079c5014c48e
font_01_sfnt_off000110e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E0 11052 bytes
SHA-256: b9dfc9082dcb9c58e8b5feb4a1eea5e50914a57b6b804a29e0505cb9c8f7786f

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