Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee54bcd8ba5075d5…

MALICIOUS

PDF

75.7 KB Created: 2021-02-17 16:29:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 3d1ff0f9d75f5c55998d9d090e0490e7 SHA-1: 51994657b49e1c69575484aa2c547f3c063d61f3 SHA-256: ee54bcd8ba5075d5bfe029d10768e8fa37a7b872be8c39483ccdabdf872e7b67
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, flagged as a link farm and a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users through malicious links, aligning with spearphishing attachment tactics.

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
  • 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://crophysi.ru/aws?utm_term=add+and+subtract+fractions+with+unlike+denominators+games In PDF document text
    • https://static.s123-cdn-static.com/uploads/4488807/normal_5ff886a8f2006.pdfIn PDF document text
    • https://mirijanonukuzo.weebly.com/uploads/1/3/2/7/132740352/76369e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461207/normal_601a86133fd82.pdfIn PDF document text
    • http://train-home.ru/38642590273m3ofd.pdfIn PDF document text
    • https://moredotaze.weebly.com/uploads/1/3/0/7/130776260/jewojededas.pdfIn PDF document text
    • http://ketousa.site/disney_books_cancel_subscriptionahihc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482189/normal_5fcf87ddcb58e.pdfIn PDF document text
    • https://jedopebo.weebly.com/uploads/1/3/4/8/134889916/5438032.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489586/normal_5fe14e3b9b70b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461746/normal_5ffe25979f17e.pdfIn PDF document text
    • https://kelogukagikuval.weebly.com/uploads/1/3/0/7/130739039/jebopisugaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381098/normal_5fd26627a0fda.pdfIn PDF document text
    • http://douchehq.xyz/16448900673hxw6t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_5fd0af4957ae3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413866/normal_600a0f42bc1c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393197/normal_602b0cf173db0.pdfIn PDF document text
    • http://coolvdomaion.online/85791859169z2r9b.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/vosimalume/nevekin.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_off0000ea61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA61 5720 bytes
SHA-256: 40c14918820e3c3fe732e4e744189d74da796b22ea2ba945215c5024a6c04fe1
font_01_sfnt_off0000fdbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBB 10316 bytes
SHA-256: 87f8d1ee290ff413b03f17b1f55f665590d815a13c51de58f424870b0b0fec7b

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