Malicious PDF — malware analysis report

Static analysis result for SHA-256 41861b5a44873c86…

MALICIOUS

PDF

75.0 KB Created: 2021-03-03 07:45:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b7002f03f52f65675bdd0819478032b2 SHA-1: 36b33f85c0bbc8fd4ca7cae709fdad236beb82f3 SHA-256: 41861b5a44873c8628e7b9960ae3637c878d9b008bc374e5a2855cc50f9cdac1
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. The embedded links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://xezojetit.ru/wix?keyword=pmp+handbook+5th+edition+pdf PDF link annotation
    • https://kilekawu.weebly.com/uploads/1/3/4/8/134857711/c7543d7188b7a.pdfIn PDF document text
    • https://venewosusi.weebly.com/uploads/1/3/1/3/131398385/3189276917.pdfIn PDF document text
    • https://begafirezudafo.weebly.com/uploads/1/3/1/4/131438667/wifojubat.pdfIn PDF document text
    • http://rebelojujiraw.iblogger.org/kung_fu_panda_3_trailer_in_hindi.pdfIn PDF document text
    • http://boludibaderujir.22web.org/12402653795.pdfIn PDF document text
    • https://fifimijo.weebly.com/uploads/1/3/4/7/134748793/9221303.pdfIn PDF document text
    • http://falutaburifa.iblogger.org/forunukud.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/xunilukegez/zedan.pdfIn PDF document text
    • http://pufiwuwa.epizy.com/tamil_bayan_for_whatsapp_status.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/50538987649.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/ponte_retificadora_kbpc5010_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/cpa_marketing_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/buildbox_free_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/68283944818.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/doxobafop.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/graco_stanton_convertible_crib_replacement_screws.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/vatewedit.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/computer_antivirus_software_full_version.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_off0000e8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C0 5304 bytes
SHA-256: b566622d4a33dfb51c8fd538fe10f516167c86e0304f903a75adbb8702063957
font_01_sfnt_off0000faab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAB 10624 bytes
SHA-256: 8592f45d7f87b475c6bb2a3653d15d7e7368fa4257ea211722c1e9a37e693daa

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