Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c463c11d185af9…

MALICIOUS

PDF

74.2 KB Created: 2021-02-26 17:49:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 16e85e0a534a8fba9a836822676fa80f SHA-1: 5f9aa8e02651db9aa09ceb5b934db48923423a87 SHA-256: b1c463c11d185af9b623990b03527430dae79ddbe62e7d5c35bc672178c767e7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' containing 28 links, suggesting a tactic to drive traffic to various sites. The primary external URL, 'https://nipisod.ru/wb?keyword=monster%202003%20film%20real%20story', appears to be a lure. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or distributing further malware.

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://nipisod.ru/wb?keyword=monster%202003%20film%20real%20story PDF link annotation
    • https://jamobosis.weebly.com/uploads/1/3/4/6/134684796/fb0f7af66c754.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471704/normal_601b81e6cd6b8.pdfIn PDF document text
    • https://xabisipejerifo.weebly.com/uploads/1/3/4/6/134634854/deac0.pdfIn PDF document text
    • https://peromukagitogim.weebly.com/uploads/1/3/1/3/131383820/rakadojapewo-boxubazi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455684/normal_602774858d49f.pdfIn PDF document text
    • http://mobeditobaxul.scienceontheweb.net/rajeb.pdfIn PDF document text
    • https://maraliva.weebly.com/uploads/1/3/2/7/132712127/peredoboku_rojixuvipipusin_kudomoxezizu_fiteduvaxaxalok.pdfIn PDF document text
    • https://sifavebizibi.weebly.com/uploads/1/3/4/0/134040704/deronup_fofudig_lisimum.pdfIn PDF document text
    • https://suzeziji.weebly.com/uploads/1/3/0/7/130739492/8285971.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/kegovev/cch_s_dng_gsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/google_chrome_free_setup.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/angelina_jolie_style_guide.pdfIn PDF document text
    • http://renubinivudeti.epizy.com/singer_heavy_duty_sewing_machine_replacing_needle.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/assassin_s_creed_odyssey_save_game_file.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_off0000e510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE510 5460 bytes
SHA-256: c2088a18445d9ac141f32b6c7432fd2ab6487810954de15c7c6227969d2269e3
font_01_sfnt_off0000f79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79A 11120 bytes
SHA-256: aa8e264da7a5750fda675e7c0fb113bdf4ad1e36a53c6c131bb38bf10a8ece60

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