Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19757a3f188b379…

MALICIOUS

PDF

72.2 KB Created: 2021-03-02 13:46:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6ecd39f14862c04f870d71a97e7d2646 SHA-1: 4f185784401e37bb924b6d72588beb38d2f7a9a3 SHA-256: a19757a3f188b379dbf5ab6afb5367a708bf005ca122d24f4e8698deae74bc0b
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm, suggesting it's designed to host numerous external links. One such link, 'https://xezojetit.ru/award?keyword=fisher-price+cradle+%2527n+swing+-+blooming+flowers', is presented in a context that appears to be a product listing, likely a lure for phishing or malware distribution. The ML classifier and ClamAV detection further support its malicious nature. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8403

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://xezojetit.ru/award?keyword=fisher-price+cradle+%2527n+swing+-+blooming+flowers PDF link annotation
    • https://sudejewakigalo.weebly.com/uploads/1/3/4/0/134040490/pobuveneve-worakizeki.pdfIn PDF document text
    • https://nimimetifav.weebly.com/uploads/1/3/2/8/132814674/8d3af42d8d.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/salade/filmywap_bollywood_movies.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/41279850941.pdfIn PDF document text
    • http://xapakiz.rf.gd/cowboy_bebop_tank_piano_sheet.pdfIn PDF document text
    • http://dajajubofu.rf.gd/automation_studio_6._2_free_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/43262486100.pdfIn PDF document text
    • http://lopusewagini.epizy.com/9265448753.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/acca_docket_report.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/34900476554.pdfIn PDF document text
    • http://rodiwelivetekuf.epizy.com/vigenowanokopipu.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/3-_d_shapes_worksheet_for_grade_1.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/nudinokupuja.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC47 5952 bytes
SHA-256: 26135676fa3096dfd0b851926083004f9b9ba57ef1bbd50f69560f542cd86b41
font_01_sfnt_off0000e03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03B 5820 bytes
SHA-256: 2078b99e77109163cb79f04562250a68625a4c1ba9608703968419f6647b90b6
font_02_sfnt_off0000f3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FB 4640 bytes
SHA-256: 8c30f8a3bebf182f79391efaf1c479fe3bf93ff66c4ef58b6f58044ae8cb2329

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