Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d6f3295613de57…

MALICIOUS

PDF

73.1 KB Created: 2021-01-24 15:44:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2cb34ba86c8fa73176996c39ca07ce09 SHA-1: 3c84446f559a326827640f3002937fd2af13cc3f SHA-256: 87d6f3295613de5780a4a2a97022e42ebb9c0b5d36f4e0dda7b2d08fa9288c98
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, pointing to external websites. One of these links, 'https://gettraff.ru/wb?keyword=fairy%20party%20decorations%20melbourne', is flagged as a known malicious redirector. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely a phishing or trojan distribution attempt.

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://gettraff.ru/wb?keyword=fairy%20party%20decorations%20melbourne In PDF document text
    • https://luwusimoxoxaxa.weebly.com/uploads/1/3/1/4/131453453/pemijelobejudiwi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459321/normal_600489c1cfb16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366374/normal_5fc8c589ed664.pdfIn PDF document text
    • https://padilokemim.weebly.com/uploads/1/3/1/3/131381900/5708223.pdfIn PDF document text
    • https://fosevagepuvuro.weebly.com/uploads/1/3/1/8/131858592/9051927.pdfIn PDF document text
    • https://vejewumuwuwaja.weebly.com/uploads/1/3/4/7/134759129/komanexivofomuravogu.pdfIn PDF document text
    • https://selijejexo.weebly.com/uploads/1/3/0/9/130969160/riwibozogew-zivenumejotuno.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/rodiligarexo/fb_video_iphone_app.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/nubiluzasikul.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/ser_biopsicosocial.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/vumojijanubonide.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/bbc_news_logo.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/amoeba_sisters_human_body_systems_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/mcdougal_littell_pre-_algebra_answers.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_off0000e178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE178 5416 bytes
SHA-256: 0d5b975b64668305e7feb4f0c2c4c090719d9a5cdc8c986b7c0c2bca0fb7a61a
font_01_sfnt_off0000f3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D2 10596 bytes
SHA-256: 7cfb0b23ff074823ae71162b9c601b84b15eaa2d38f24b318060df9440214f2f

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