Malicious PDF — malware analysis report

Static analysis result for SHA-256 b891218441c2ec09…

MALICIOUS

PDF

76.6 KB Created: 2021-05-09 06:41:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6e0813731c7830fa0217b4eb8d07cb0 SHA-1: ab97345e8b81f725fd4fe3be30839f2a51de1cb6 SHA-256: b891218441c2ec0942279963ece32753b09ce10f8f839f8c56250cd7f85ef029
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as https://jacksth.ru/strik?utm_term=iso+9000+quality+management+system+ppt, are likely used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=iso+9000+quality+management+system+ppt
    • https://cdn-cms.f-static.net/uploads/4385424/normal_5fd2238676084.pdf
    • http://alkim.xyz/the_rivera_family_tree_coco6eynd.pdf
    • http://present-mag.ru/are_fruit_bursts_gluten_free1uqv5.pdf
    • https://cdn-cms.f-static.net/uploads/4453553/normal_603efbeb69b29.pdf
    • https://static.s123-cdn-static.com/uploads/4366949/normal_5fde89cc74686.pdf
    • https://cdn-cms.f-static.net/uploads/4372072/normal_606113edc9245.pdf
    • https://cdn-cms.f-static.net/uploads/4466411/normal_60450832425c9.pdf
    • https://static.s123-cdn-static.com/uploads/4498330/normal_600672e565e3e.pdf
    • http://zajowidased.iblogger.org/drawing_application_for_pc_free_download.pdf
    • https://cdn-cms.f-static.net/uploads/4459464/normal_60310daeed8be.pdf
    • http://nikecortez.net/288935434690o1cg.pdf
    • https://cdn-cms.f-static.net/uploads/4406223/normal_5fd62974bd0d2.pdf
    • http://foyou.store/how_do_i_know_my_jaybirds_are_chargingoh61m.pdf
    • https://cdn-cms.f-static.net/uploads/4423148/normal_602d0dcc32c92.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ruzumeb/adanga_maru_movie_online.pdf
    • https://s3.amazonaws.com/winumigutam/19460521763.pdf
    • https://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_78904673114f4d42bc60b22cdf1b6198.pdf?index=true
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_00357f99b462478ca13427aa4fedc86f.pdf?index=true
    • http://japixivi.epizy.com/capture_one_sony_free.pdf
    • http://naratide.epizy.com/7339372973.pdf
    • http://wepebodup.rf.gd/essay_topics_for_grade_7_icse.pdf
    • https://s3.amazonaws.com/bulolimepol/les_oiseaux_du_qubec_guide_d_identification.pdf
    • http://todewafigonof.rf.gd/40932318041.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef63.bin
b1299a4962cde781e602d0186240a67d81dbc0322fd31357bc8ecc707dc6394b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF63 5508 bytes
font_01_sfnt_off00010217.bin
df594948c819e5f7a5ec41cf59ae975c327dc993e4a2c23f307e9d58a52c52c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10217 10296 bytes

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