Malicious PDF — malware analysis report

Static analysis result for SHA-256 be08e63fb1c3a4e0…

MALICIOUS

PDF

68.7 KB Created: 2020-12-15 12:52:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: ca141e256f437de06a0da2e94d860316 SHA-1: 19f7f80f01c63a2561c04a3b1800bfee24328173 SHA-256: be08e63fb1c3a4e086a2fa35e228a4c432dd880aad490ca1400d4dcc5788d972
214 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution attempt. It contains a link farm pointing to numerous PDFs, including a redirector to 'traffking.ru', suggesting an effort to drive traffic to malicious infrastructure. The document body, though heavily obfuscated, appears to be a lure related to a 'general chemistry final exam study guide'. No scripts were extracted, but the presence of malicious links and the overall structure strongly suggest a phishing or malware delivery vector.

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://traffking.ru/123?utm_term=general+chemistry+final+exam+study+guide In PDF document text
    • https://static.s123-cdn-static.com/uploads/4407066/normal_5fc744cd4a2b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369771/normal_5f8885f1b0e42.pdfIn PDF document text
    • https://tajurasexir.weebly.com/uploads/1/3/1/6/131606020/tasezekavudosewulo.pdfIn PDF document text
    • https://tixoguwod.weebly.com/uploads/1/3/4/6/134694164/44ef96a27690.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446937/normal_5fb5de38efee0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384649/normal_5fb7e49fa8d57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_5f9f7c6c66799.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/1216d168-4d4f-4184-b508-582c43b0d1e9/33901951924.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2642b01a-d4a6-40a8-ad90-679c15961126/nadowuvamatefagexajeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f11e3b6-4e3b-4bdf-ac60-ad59123b7215/beautiful_vietnamese_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44e29b8b-af4a-4475-9e42-f1a502fa5c35/psn_codes_hack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59abb04c-7689-4d33-8bcf-cd37bc0d8342/10057900631.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c368b63-419c-4292-83fe-4d681d9d34de/49985409248.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82069f92-b744-422f-8144-a989a1f174b8/longman_introductory_course_for_the_toefl_test_audio_free_download.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_off0000d04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04A 5636 bytes
SHA-256: 4c5ba64ad3f98007e6f2722f1f47e0b29239cb8bbba1133cb985c2b35c47c7b3
font_01_sfnt_off0000e35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35A 10104 bytes
SHA-256: 398f76f2d122cae4c062307bfb3a86bf2afd77a8f715a508390aeaf4a8ccc6a0

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