Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24c158ff7a0f547…

MALICIOUS

PDF

76.8 KB Created: 2021-05-24 15:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 2913a915085271567377929cd147fa63 SHA-1: 438e260d40ef1853c31ed60863712f074a6270ae SHA-256: c24c158ff7a0f547955d91145115171f0a1def95f67daef5e90affc3bd547b42
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. The document body, though heavily obfuscated, suggests a lure related to a 'translation'. The presence of multiple Weebly-hosted PDF files and a suspicious URL indicates a likely attempt to redirect users to malicious content, potentially for phishing or malware delivery. ClamAV also detected this file as Pdf.Phishing.Trojan.

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
  • 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://jottigo.ru/strik?utm_term=la+barca+sin+pescador+english+translation PDF link annotation
    • https://laximazerafa.weebly.com/uploads/1/3/4/2/134235816/d282cbb497a81e8.pdfIn PDF document text
    • https://foniliwis.weebly.com/uploads/1/3/2/6/132695455/dudidezudegitekoje.pdfIn PDF document text
    • https://simebofes.weebly.com/uploads/1/3/1/4/131438459/gegoxejomawiro.pdfIn PDF document text
    • https://gitakitopawal.weebly.com/uploads/1/3/5/3/135325500/8466b3182306.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454172/normal_60332fac9c00e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451567/normal_5fe3b93820528.pdfIn PDF document text
    • https://nosuzodudoj.weebly.com/uploads/1/3/4/5/134588086/7838956.pdfIn PDF document text
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/944458.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/jenisozazewubo/74204965469.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a6cae9c-bbc7-4004-9225-e910143d18bc/rujewesizusafezubuzufonu.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/data_communication_and_computer_networks_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/vavamuka.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/6808509163.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/lobuzipuzuniwekamilopuva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea382698-f191-4c72-b8f7-e39fc86a57e9/lexmark_ms310d_photoconductor_kit.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/26984702688.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/73411418062.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/tipos_de_actuadores_hidraulicos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d503a179-196b-4047-abe9-268f021efc27/brown_driver_briggs_lexicon_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_off0000eb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB63 5416 bytes
SHA-256: 8a1d5d84ec39ada1e297f9128138877341f5775ef3605ce721a2ef927148bfe2
font_01_sfnt_off0000fdbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBE 11688 bytes
SHA-256: 53f535263720fe2d1d4a6aef93b27d12d0a8fc03d155797f5e6f4c19c83ca017

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