Malicious PDF — malware analysis report

Static analysis result for SHA-256 9945075097a6acec…

MALICIOUS

PDF

70.5 KB Created: 2021-02-17 14:42:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2a7fbeec900e10e3007839c2f2d66fa8 SHA-1: d505403f8f10104309f8dfcf6addc93ab1c29988 SHA-256: 9945075097a6acecdaee59d728aa06061d66d89c91c83e1f36c7f359cdde4299
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'crophysi.ru'. This URL is likely part of a phishing campaign designed to lure victims to a fraudulent website. The ML classifier and ClamAV detection further support the malicious nature of this PDF, indicating it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/strik?utm_term=inspiron+3847+ram+slots In PDF document text
    • https://static.s123-cdn-static.com/uploads/4423429/normal_5fd0663a10797.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476954/normal_600072f9b44c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380869/normal_5feec71a37c16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370309/normal_5ff70ea71ffbc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500670/normal_5ff9f3d745f50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425487/normal_60247e62388bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384144/normal_6022dfd0e81a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406793/normal_600c6d9658aec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404116/normal_5ff3bce206789.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366011/normal_6026caa86eb16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448346/normal_60141f50b3058.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475737/normal_5fff521b196ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388037/normal_5fc7394359177.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389606/normal_5fe8acdc8a338.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gekekenam.rf.gd/12515666531.pdfIn PDF document text
    • http://refiwamidur.rf.gd/15464414507.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_off0000d4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CF 5428 bytes
SHA-256: 116a233c11fe973b1f38c7c41a16b0b71c652bd12d3ce1b167bb79e8cdd8e5e4
font_01_sfnt_off0000e737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE737 11132 bytes
SHA-256: f711de1941d63fd06cfe7f15d41d0cb0ca80c1541dcee61d90cfdd7928620f5a

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