Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b5a7fd42f7fc0c…

MALICIOUS

PDF

71.3 KB Created: 2020-12-06 21:42:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 54f77f2c388e98e10b3c6a0d4aab20f3 SHA-1: 7f7a01b2adaba9299977964fb0526234ffca4e9f SHA-256: 79b5a7fd42f7fc0c160b72210abf85c2b82f0723bdb37beacff3174af06f31b9
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to a known malicious redirector (traffking.ru) and another to a link farm (loraxero.weebly.com). ClamAV also detected the file as Pdf.Phishing.Trojan. The ML classifier strongly indicates maliciousness. The presence of embedded URLs and the nature of the heuristics suggest an attempt to lure users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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.
  • 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://traffking.ru/strik?utm_term=gmt%252B7+to+pst In PDF document text
    • https://loraxero.weebly.com/uploads/1/3/4/3/134332649/5958722.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405179/normal_5fb38323745d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391893/normal_5fc06af9eb537.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381531/normal_5f8c3dc8f38af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452382/normal_5fb017b835197.pdfIn PDF document text
    • https://nunezujotegu.weebly.com/uploads/1/3/4/3/134312528/9721022.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b84d465-1548-4526-9510-23f3efb58549/48209918567.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/39120756942.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/98149180835.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39ddcda4-be41-40c0-806f-f869727d6c33/kutod.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/33414549480.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cb73bb4-f23c-42d8-9171-7505ea811688/74579448003.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5168716f6d44b07d98e8b/t/5fca794acef45959076af604/1607104843937/76728680432.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_off0000db61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB61 4740 bytes
SHA-256: 1f1ced1ad1cec5b18d101348db67142eecbbfbee47dbf63073d80d2fe498a4a6
font_01_sfnt_off0000eb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB82 11064 bytes
SHA-256: 5b625531d429fa51cf869cae2fdfc0a26777529d48d9e0e64f5a86eb48ecaaf3

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