Malicious PDF — malware analysis report

Static analysis result for SHA-256 a147a02744cae308…

MALICIOUS

PDF

70.1 KB Created: 2021-02-14 17:19:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5973e55eb9254e6d280c444cb26ae1de SHA-1: e8edf55f49c73e388cc7720375f2397df26c7f63 SHA-256: a147a02744cae3087e6f9a30abbba65743eb21869072d4e8e0b375e84a886163
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The PDF contains a large number of external links, including one pointing to a potential second-stage payload at 'https://s3.amazonaws.com/ladiwuzetawedi/xeleragedawiku.pdf', suggesting an attempt to redirect users to malicious content or exploit kits. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often abused for creating malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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://jacksth.ru/aws?utm_term=consumismo+definicion+pdf PDF link annotation
    • http://trysoda.club/borland_pascal_7._045no6.pdfIn PDF document text
    • https://tonituligavu.weebly.com/uploads/1/3/4/8/134884188/zitera.pdfIn PDF document text
    • https://wujuxibivotalo.weebly.com/uploads/1/3/1/4/131453464/3037600.pdfIn PDF document text
    • https://kafunonedejo.weebly.com/uploads/1/3/4/6/134662894/ca81a.pdfIn PDF document text
    • http://marinarus.space/paul_britton_capstone_wife5324h.pdfIn PDF document text
    • https://libufuvebugun.weebly.com/uploads/1/3/1/4/131406816/7e6c30e1.pdfIn PDF document text
    • http://distornyup.site/vukujxvpuj.pdfIn PDF document text
    • http://trokot-online.xyz/acting_lessons_apkecgfh.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/ladiwuzetawedi/xeleragedawiku.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/investigation_representing_inverse_variation_functions_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/fawibowepuramakuf.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/16844464140.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/4305530963.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/publication_15_employer_s_tax_guide_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/lagorigepaniwemeledabujit.pdfIn PDF document text
    • https://s3.amazonaws.com/wemofodi/teachers_day_wishes_pictures.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/20842347568.pdfIn PDF document text
    • https://s3.amazonaws.com/mevuzokekenojab/juvitolu.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/badminton_league_game_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/building_construction_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/amoeba_sisters_llc_answer_key_classification.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/google_sheets_contact_list_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/realidades_capitulo_2a-_6_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/liquid_nitrogen_generator.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_off0000d948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD948 4868 bytes
SHA-256: 5293cf949cc36947dfea2bdb33c224cd5d9c9d26e30bea2b5d4383247e090380
font_01_sfnt_off0000e9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CA 9632 bytes
SHA-256: 64322f92cbf34e136daf30cb0d9c2c5012235690d7350dd9e3c222469946757d

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