Malicious PDF — malware analysis report

Static analysis result for SHA-256 798eaca22acf4682…

MALICIOUS

PDF

72.1 KB Created: 2020-11-28 08:40:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 2e226979adcef8c03ac1f772ab4c0ea5 SHA-1: bdfe7dac75d161e068b4765ad6f28b935eb3f48e SHA-256: 798eaca22acf4682bbe0b325e86bee7b4ca4f27c2d4c0ea7ac9ed1e4a1530cc4
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector and a link farm. The primary malicious URL, 'https://cctraff.ru/strik?utm_term=two+column+proof+answers', is directly linked to malicious redirector infrastructure. This suggests the document's purpose is to direct users to potentially harmful sites, likely for phishing or malware delivery.

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/strik?utm_term=two+column+proof+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370989/normal_5f8bc9cb45dd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427793/normal_5f9a13e0b257f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366042/normal_5f8a5680783e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485576/normal_5fbd85e35efd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445340/normal_5f9f94102f30a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380083/normal_5fac2380b8ef1.pdfIn PDF document text
    • https://lisajakuxateril.weebly.com/uploads/1/3/4/3/134349263/2af2ea.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/fenatagazise/hippocrene_guide_to_the_underground_railroad.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/chakka_bajana_patalu_naa_song.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/51598078888.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/10028129166.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/model_md529ll_a_ipad_mini.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/16771755247.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/handbook_of_agriculture_free.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/kumpulan_soal_un_biologi_sma.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/extraction_2020_full_movie_free_online.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_off0000d865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD865 5200 bytes
SHA-256: 2ded1d4886bc74ee6a828155da93f5675996c628670c7af62053a304655c3882
font_01_sfnt_off0000ea0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0F 12364 bytes
SHA-256: 1883208538f4c32d508153ef7d8ef78fa621adbf9716d7b2adcbdc98bee1dd90

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