Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d6a0fa5daa5ca3d…

MALICIOUS

PDF

72.9 KB Created: 2021-02-20 01:01:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 41baf1745541bfa5a7de4ac1920b0e67 SHA-1: d34039d6e94837e92f00d5753faaa141a9f169ef SHA-256: 7d6a0fa5daa5ca3d999f30864d68e0b72db0a3b91bbaac4aafdf1cad905ba38d
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, designed to redirect users to malicious infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically calls out a link to 'crophysi.ru' which is associated with malicious redirector activity. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

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://crophysi.ru/wix?keyword=super+mario+google+maps In PDF document text
    • https://nevipezuke.weebly.com/uploads/1/3/4/6/134652321/71010bf.pdfIn PDF document text
    • https://lezanixopedem.weebly.com/uploads/1/3/4/8/134886347/501b1800.pdfIn PDF document text
    • https://pudevadiketimim.weebly.com/uploads/1/3/4/6/134606785/guvunofipijaluvoba.pdfIn PDF document text
    • http://classkaod.ru/acta_constitutiva_de_sociedad_anonima_mexicanae6dkd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477386/normal_5fdc87c191657.pdfIn PDF document text
    • http://goodsun.fun/15_freeway_accident_reportjw3t9.pdfIn PDF document text
    • https://xuvibelatubeni.weebly.com/uploads/1/3/5/3/135306186/lutebolimu_fitobo.pdfIn PDF document text
    • https://gegirugotosizuk.weebly.com/uploads/1/3/5/3/135397722/paloji.pdfIn PDF document text
    • https://kupelaranix.weebly.com/uploads/1/3/4/7/134729830/c1c09e129.pdfIn PDF document text
    • https://ranilabat.weebly.com/uploads/1/3/5/9/135999147/bexugerosujixot_fasij_kepemutuvufema_retamomi.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/dugibabafod/meal_prep_guide_for_bulking.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/25072278289.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/asphalt_8_airborne_hack_direct.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/bluffers_guide_to_skiing.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/pizedawemefatesinopis.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/27860322342.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/lamentations_of_the_flame_princess.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_off0000e242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE242 5240 bytes
SHA-256: cf37b32077f4513daca04cc39d120508d4436b395a29f09e5fca1d4cb4efc8fc
font_01_sfnt_off0000f3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F7 10328 bytes
SHA-256: 52dd73b859787aab8d89668b2040c25559e8eaa09a1f46270f6758f252bfca19

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