Malicious PDF — malware analysis report

Static analysis result for SHA-256 7391de94e56991f6…

MALICIOUS

PDF

74.0 KB Created: 2021-01-06 22:11:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 061f08c4262aeb44f5c65bd1c5d2dbea SHA-1: cb1a678ba931a3ec9270c08b070d1fd4a54a0750 SHA-256: 7391de94e56991f66283bfdbe5275d0c542a93212b835383c4c239e55ea6a320
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and the PDF structure, particularly the link farm heuristic, point towards a phishing or malware distribution campaign.

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://traffnew.ru/aws?utm_term=human+cheek+cell+lab+report+conclusion PDF link annotation
    • https://wizamezuladad.weebly.com/uploads/1/3/4/3/134351213/9888042.pdfIn PDF document text
    • https://napokepuwaju.weebly.com/uploads/1/3/1/1/131164128/pejuzo-noresejipigune.pdfIn PDF document text
    • https://samomalekadoj.weebly.com/uploads/1/3/1/4/131438786/9633391.pdfIn PDF document text
    • https://rabugotekinevod.weebly.com/uploads/1/3/1/8/131871666/f071c5.pdfIn PDF document text
    • https://nosuzodudoj.weebly.com/uploads/1/3/4/5/134588086/nivezobe.pdfIn PDF document text
    • https://devigumekumowir.weebly.com/uploads/1/3/4/3/134394761/4482073.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/246cc7d1-b58c-4f32-85d3-fc460d86b6b5/lovejoy_pizza_main_st.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2eb3e6f-d51f-4a48-a75a-36fe69f236da/fewogifurilobuwepesamad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/278cf550-a7c7-4171-bb1d-e2e522ca0adc/45534372081.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06976e0c-0b76-421f-a3a9-f79faa0597f5/jet_3_ultra_power_chair_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69f58580-7e86-485b-a851-d9017a7ee7a9/dusodubaxitesudujinami.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_off0000e4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B8 5340 bytes
SHA-256: a0eb4f5f8e23f8c518690d322cac14592fedbf04624562ff58865b64eec9a7fd
font_01_sfnt_off0000f6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A6 10828 bytes
SHA-256: f822ffb1e3272204325ffa248668e66d89d6a58d9058673a5e7e911d84edb107

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