Malicious PDF — malware analysis report

Static analysis result for SHA-256 759a06b2b6018d93…

MALICIOUS

PDF

58.5 KB Created: 2020-12-08 18:46:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 4e5aa393294cf8e3d1dd968b65221e9f SHA-1: 89ecfa1470654f2f7b81609cd0db0f916600cf84 SHA-256: 759a06b2b6018d93c63a1f55e025706d954f6bca45c22b0c0aabde0f6b9f7c35
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating a high probability of maliciousness. The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or redirection mechanism. One of the embedded URLs, 'https://trafftec.ru/strik?utm_term=factoring+trinomials+a+1+worksheet+with+work', is likely part of a phishing or scam campaign, disguised as educational content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafftec.ru/strik?utm_term=factoring+trinomials+a+1+worksheet+with+work PDF link annotation
    • https://tapuroxoj.weebly.com/uploads/1/3/4/5/134599682/7026475.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465147/normal_5fc80b7a348c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405190/normal_5f9a01e86d1df.pdfIn PDF document text
    • https://dojifidixiwaji.weebly.com/uploads/1/3/4/3/134372722/vuninivisovirojezup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463812/normal_5fc396638d74d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393029/normal_5fa6571ceddcf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0dc232cf09257bd6bd446/t/5fc649e34e98326c02e7a53a/1606830563920/lowuripisikixekevo.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/96617995167.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/ready_north_carolina_mathematics_8_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d52e3dfdd95b60d4bb65/t/5fc6c6d6e2dcb1274dd94c45/1606862551741/superhero_tricky_bike_race_mod_apk_unlimited_money.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc118eb27a199023ab67ebc/t/5fcab29351120475abc6b417/1607119508046/33101329375.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2d6f9ff13940aa24c3a4c/t/5fc5700b3485235c867ea5f4/1606774798102/pierce_knight_leveling_guide_ragnarok_mobile.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f7f0c6d9645836228a25/t/5fc66f81f3de5e49b542e088/1606840193306/argentina_imf_program_2001.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_off0000ab67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB67 5376 bytes
SHA-256: b893b9219269988c4ed8fc598b28ba99f9965ca17ea07a6f99795aa4a58b9f35
font_01_sfnt_off0000bd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD9E 9164 bytes
SHA-256: 0cf75d5e5b4c48b2a7ecfd309602dc9d192159bf4f6071e74c639b2c19de8d64

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