Malicious PDF — malware analysis report

Static analysis result for SHA-256 1effe9a47528cd6c…

MALICIOUS

PDF

59.8 KB Created: 2020-11-27 10:33:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b1176a14021ffa88f45d414893002859 SHA-1: b5d9322c995dc060eab3ba39e69752639e504937 SHA-256: 1effe9a47528cd6c84090b3a455bc9a3b653248995e5b6a2ed5d85ea2722427b
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, directing users to various external PDF documents. One of these links, 'https://traffmen.ru/aws?utm_term=cut+songs+free++malayalam', is flagged as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffmen.ru/aws?utm_term=cut+songs+free++malayalam In PDF document text
    • https://terarawuterojuz.weebly.com/uploads/1/3/0/7/130739827/davexonavajedizugala.pdfIn PDF document text
    • https://diloxutal.weebly.com/uploads/1/3/4/5/134598378/aba133.pdfIn PDF document text
    • https://tusidotug.weebly.com/uploads/1/3/4/4/134482214/d3ae4d7571a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459029/normal_5fbd9e3f200a7.pdfIn PDF document text
    • https://gewaxuselez.weebly.com/uploads/1/3/4/2/134265722/wepavawu.pdfIn PDF document text
    • https://rulomegujenuguv.weebly.com/uploads/1/3/4/3/134329868/8685457.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/davawina/wosulabarafudolafaz.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/38068430697.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/lumilagukakamuwuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec6e7dcb-f58a-43f6-a441-1220ea028a1e/64152528450.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/basic_esl_grammar_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/sezutuma/wiwipu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d671f0a0-a80c-4a25-8a65-5f4c1fe64cbc/vefisetoselopuxagisa.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/a_couple_of_forevers_fakaza.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_off0000af67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF67 5092 bytes
SHA-256: 9015f307e1d5097043110fe4a0c0e81a80dfea84329d2866148dcc0942c93578
font_01_sfnt_off0000c0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A4 10092 bytes
SHA-256: fba588d0e947e608ad5cc23015c9b3352c6eb56819b4c9b9183260f0b8c4d43f

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