Malicious PDF — malware analysis report

Static analysis result for SHA-256 290591cf9a52c22e…

MALICIOUS

PDF

72.9 KB Created: 2021-02-28 04:46:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9448a83f15f2f908abb361480ff89fba SHA-1: 62def7bb940e77873e5f809912b65433dd5af1cb SHA-256: 290591cf9a52c22e608e179392b1ba1dc13b39b69d5d775c079e2ccaeade8a51
214 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including a critical finding of a redirector link to 'yafferge.ru' and a PDF link farm. The ML classifier and ClamAV also flagged this file as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document is designed to lead users to malicious sites, likely for phishing or to download further malware.

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://yafferge.ru/strik?utm_term=oxford+picture+dictionary+for+kids In PDF document text
    • http://birjand.design/how_to_study_general_organic_chemistry5f03f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381751/normal_5ffc81b9ca1c5.pdfIn PDF document text
    • http://starkrobotics.org/how_to_use_smart_watch_apple48epw.pdfIn PDF document text
    • https://faxasuxudoxo.weebly.com/uploads/1/3/2/6/132695360/091e4ddbd1.pdfIn PDF document text
    • https://fekakekofum.weebly.com/uploads/1/3/4/6/134656499/3410561.pdfIn PDF document text
    • http://remont-pc.website/tazizabaladisukejeroxgnp.pdfIn PDF document text
    • https://kuvikupomudu.weebly.com/uploads/1/3/4/4/134457818/nofujopebokigoloto.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/zuses/chronic_hepatitis_c_treatment_guidelines_aasld.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/substation_design_guide.pdfIn PDF document text
    • http://xabimeweveme.epizy.com/zonewexugilanuruf.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/whatsapp_for_pc_software_windows_8.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/29658730255.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/84095072019.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/merlin_entertainments_annual_report_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/40523250600.pdfIn PDF document text
    • http://zusunikumejimet.rf.gd/68034599424.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/dupufegaregujit.pdfIn PDF document text
    • http://duzexatalug.rf.gd/tumudaded.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_off0000e059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE059 5380 bytes
SHA-256: 54970f9c7c3c0d7573a7b0ae6bfc1550eb9d7a6ce86e18f26f358d8c97191258
font_01_sfnt_off0000f2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C3 10556 bytes
SHA-256: 11193e693daa6c4f18aa1d0a71dc4884e62ba0be0e997f5ea0b6fb374b1e40c7

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