Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9b45e01f87e915…

MALICIOUS

PDF

74.8 KB Created: 2021-01-21 18:41:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 975735fc0bd072793ba7946f310e961c SHA-1: 1d1af0b3be809261fce750c5ae89c8f66c799f08 SHA-256: cf9b45e01f87e915545dc720c726abe71bf2b8bc74d16f0bc1145e6afb96eb4d
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of malicious URLs is a high-priority indicator.

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://traffine.ru/123?utm_term=apk+firefox+browser In PDF document text
    • https://static.s123-cdn-static.com/uploads/4452846/normal_5fcbc1395fb76.pdfIn PDF document text
    • https://site-1166708.mozfiles.com/files/1166708/kafeverixileradebuzixevi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414335/normal_5fd06fec90ef0.pdfIn PDF document text
    • https://mobinefoju.weebly.com/uploads/1/3/1/3/131398425/murugukenoxal.pdfIn PDF document text
    • https://nukimaxirob.weebly.com/uploads/1/3/0/7/130776041/3186351.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421624/normal_5ff19d24e95d4.pdfIn PDF document text
    • https://kitipodowenin.weebly.com/uploads/1/3/5/3/135383326/e486f87de9.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/xarojapi/all_airport_codes_in_the_world.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/ross_tech_vcds_lite.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/donoparudekimizetanisatib.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/57994023102.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/shark_river_nj_fishing_report.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/dalojomatibu.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/63295607283.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/naca_airfoil_nomenclature.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/o_que_significa_a_palavra_uniformemente_variado.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8A 5008 bytes
SHA-256: 75550c698adf8e8312b4326f729a3dfbadc9f4ebf8c864d9b4ef3c301f7c5ada
font_01_sfnt_off0000ddba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBA 13608 bytes
SHA-256: c6fc99d3e850b47af8c447be99666d34001a3cfb2e263331a8447e2044032a75
font_02_sfnt_off0001067c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067C 16376 bytes
SHA-256: f9029c8cf060343eeba1eb6741d6cf6f834834640c7215f8a40fd292cbbd685e

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