Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5665e178382c21f…

MALICIOUS

PDF

71.9 KB Created: 2021-01-16 16:41:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3d64117648e406a280e1ad7729d2ffc3 SHA-1: b3d939868b13adc6b16d7909eaeced245a9f57a9 SHA-256: b5665e178382c21f2cb34c0731be1b0b71147c26ce6e27907c2fb9d7f5b833e5
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with one identified as a malicious redirector and others forming a link farm. This strongly suggests the document's purpose is to direct users to potentially harmful websites, either for phishing or to distribute further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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/aws?utm_term=2012+charger+srt8+performance+upgrades In PDF document text
    • https://static.s123-cdn-static.com/uploads/4417123/normal_5feb5fe497a35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483070/normal_5ffc0ec0e37b5.pdfIn PDF document text
    • https://site-1168299.mozfiles.com/files/1168299/more_speak_english_like_an_american.pdfIn PDF document text
    • https://xufodikufidu.weebly.com/uploads/1/3/5/3/135382923/fulafagaworunu-tisew-xififobebe.pdfIn PDF document text
    • https://sopodepewujo.weebly.com/uploads/1/3/4/3/134340903/9103012.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374715/normal_5fc676894dd02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385004/normal_5f9992bb144b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412183/normal_5fed437c290af.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/gosete/aarti_sangrah_audio_free.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_off0000d798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD798 5960 bytes
SHA-256: 16396ddfd2dd5855d8d0ae421398c7ced1f5356e1462abeacd183a969738f49b
font_01_sfnt_off0000ebb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB8 11536 bytes
SHA-256: 1a0af2dada5c1f5a04940a92c99f077b8b28eb4b7911d2710740b97cf5060c72

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