Malicious PDF — malware analysis report

Static analysis result for SHA-256 21744b5969da8c4f…

MALICIOUS

PDF

77.2 KB Created: 2020-11-13 06:23:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 998abdb48139bb039f8b41bfa4f23466 SHA-1: 7efafb6f6f27e7129c786e14b8cf034e714441b4 SHA-256: 21744b5969da8c4f7be086f1c56d6ed4cc59fa3facd45dd3fb9737f7bc33c872
214 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector. The heuristic firings indicate the document is designed to link to external content, likely to facilitate phishing or malware delivery. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cctraff.ru/aws?utm_term=uses+of+concave+and+convex+mirror+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413369/normal_5fa47775eac54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404515/normal_5f9691a0d83c2.pdfIn PDF document text
    • https://defelewag.weebly.com/uploads/1/3/2/7/132741475/zazoxofuvabas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/712309f5-1304-4bcc-ae6e-af8ed51186f6/52860519863.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/jetusixakazifibub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60d385ab-f04e-4ae7-bb2b-1008b27d6e0a/have_a_little_faith_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/wifozuxeku/5426179085.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/32017685654.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3f3080e-1355-4fbb-a41d-1d51543660f6/9200129979.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/seroximuzonos.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/37756631550.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/performance_success_performing_your_best_under_pressure.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_off0000da2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2F 5388 bytes
SHA-256: 34374924680983d44abee3e95824ea9ef3e863487e0fddd67fa6e12c4df70279
font_01_sfnt_off0000ec80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC80 11220 bytes
SHA-256: aad235abe2b129196d8d97c3382a7e9a71bdb3e8d12bbe4dc058cd37e36bb7a3
font_02_sfnt_off000112ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EC 16036 bytes
SHA-256: 52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550

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