Malicious PDF — malware analysis report

Static analysis result for SHA-256 1655f5d3b4dfe113…

MALICIOUS

PDF

127.8 KB Created: 2021-01-01 05:31:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 3981682ecde30e21287b1d5547a1226a SHA-1: 0facfd17d634cffccff741a26f08d1fb66c7c13b SHA-256: 1655f5d3b4dfe113be445ad33486e18807b09a95d8f690b53069f1e207a4d40e
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, including one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a search query, suggesting a lure. The presence of numerous PDF links and the ClamAV detection strongly indicate a phishing or malicious redirection attempt.

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
  • 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/wb?keyword=show%20me%20a%20map%20of%20bowling%20green%20kentucky In PDF document text
    • https://jafakafewubili.weebly.com/uploads/1/3/4/3/134397715/misajofalomigir.pdfIn PDF document text
    • https://fitisasituwag.weebly.com/uploads/1/3/4/8/134846324/fimapitixadajuvo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389797/normal_5fd5f6d5a749c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475997/normal_5fc11b3130ecb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365567/normal_5f87308071e8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384142/normal_5fad9f47e6789.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365624/normal_5fe49d9b4abbe.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/96cd897a-65df-4906-9c2b-c95bd5126a33/kara_kpr_narlktr_sakarya_frat_mp3_indir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45b0d19a-a00e-4052-9c95-abad2a5998d7/60-70_fishing_guide_ffxiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adb82b89-fe82-46d8-8692-790e6ea3801d/rukebixegokubavidewawu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35f5364f-2016-4916-8d40-84081b1527dc/diaphoresis_medical_dictionary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72cde926-ad76-4335-b9db-edbfa833a7be/48293393568.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_off0001b9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9AF 5752 bytes
SHA-256: 4dc2d7ea9a1237ab4caa3fdb0c34294029e26e5c6207dedc67c33cf3b2178094
font_01_sfnt_off0001cd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD31 10884 bytes
SHA-256: cd676638a9be37c0bd00029d760ab11aeacdb380bf383c80271a7424d9eeae3f

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