Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba4e13306541754a…

MALICIOUS

PDF

77.5 KB Created: 2021-02-24 13:54:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d8ed569070310202a6347318af0b06f0 SHA-1: 75c1c694b5ec49288ae29bff026180aa22b7fb22 SHA-256: ba4e13306541754a80de86922b46c8d7375c58e5e4325ca9a560929e795346e7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO spam or phishing. One prominent link, 'https://seumenha.ru/strik?utm_term=can+you+send+usps+from+home', suggests a lure related to postal services. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host a large number of external links.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://seumenha.ru/strik?utm_term=can+you+send+usps+from+home PDF link annotation
    • https://cdn.sqhk.co/vupapevixu/jbmjjKS/bulen.pdfIn PDF document text
    • https://cdn.sqhk.co/mivijigonof/eid3HKK/pathogen_free_meaning_in_urdu.pdfIn PDF document text
    • https://cdn.sqhk.co/zewumirapeb/01hcifD/11686020540.pdfIn PDF document text
    • https://cdn.sqhk.co/dejijadu/Odieijb/princess_and_the_frog_quotes_prince_naveen.pdfIn PDF document text
    • https://cdn.sqhk.co/jazumagefo/ifNicgd/pop_music_mix_2019_clean.pdfIn PDF document text
    • https://revixapega.weebly.com/uploads/1/3/4/6/134619396/rifesibo-xebokuvinuz-siziluwapa.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/hhc1rjg/power_audio_music_player_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/gdgoi3E/16995039670.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/xirixepo/wujosev.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/vapuvivumebalapirakedogo.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/73861658645.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/project_timeline_template_ppt_free.pdfIn PDF document text
    • http://kufuravolej.rf.gd/maplestory_2_striker_build_guide.pdfIn PDF document text
    • http://tegewixu.epizy.com/64893516790.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/22353222588.pdfIn PDF document text
    • http://nebejobibaveb.epizy.com/23313797613.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/xepelifazuti.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_off0000f298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF298 5256 bytes
SHA-256: b4acede56752ee7f21ab4b0eabf9cef8a39086167023db03cd757ce870556e44
font_01_sfnt_off00010455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10455 10756 bytes
SHA-256: d1947e9a1678caf3723a6da110e64e90df9a2e45e49e7675fed2f46a2643722a

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