Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f42cbd35bba11a…

MALICIOUS

PDF

76.3 KB Created: 2021-03-18 09:45:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d1d87b5739984cd0b37198fe2d7dde5 SHA-1: 1608157a4d71a5af9540a2a46cd5e6baea1dde20 SHA-256: a1f42cbd35bba11ab92b14794d690b6654122bd7d35cb37d9a84d229a4962da6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to potentially malicious domains, indicative of a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to phishing sites or download further malicious content.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/award?keyword=afscme+contract+illinois+pdf
    • http://fanexaxujuto.22web.org/wuremawoveruxikujotop.pdf
    • https://wixiwifutavoma.weebly.com/uploads/1/3/5/3/135301275/6596390.pdf
    • https://felunazajejo.weebly.com/uploads/1/3/5/9/135959991/234ff99f6.pdf
    • http://xobigapirig.iblogger.org/91460492276.pdf
    • https://funemozivadomuz.weebly.com/uploads/1/3/1/3/131398429/5a25e.pdf
    • http://golomashvanna.xyz/756606432273dh05.pdf
    • http://wedavinonuvovu.22web.org/gymnastic_bodies_thrive_review.pdf
    • http://euroshopmn.space/38002123743jmjtl.pdf
    • http://tdsevsvet.ru/future_tense_worksheets_for_2nd_grade1wjmi.pdf
    • https://zagefejov.weebly.com/uploads/1/3/2/7/132710748/fixulilut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1a95ed01-5860-4571-9045-823aafdf0e29/real_analysis_royden_solutions.pdf
    • https://uploads.strikinglycdn.com/files/7aa09d9d-a9be-438a-afd7-afecd7f9839c/how_long_does_the_dyson_v10_battery_last.pdf
    • https://s3.amazonaws.com/verirejon/third_eye_movie_free.pdf
    • https://s3.amazonaws.com/vikukinumet/convertir_de_a_word_nitro.pdf
    • http://lozisuvuxinosog.epizy.com/27884334401.pdf
    • https://s3.amazonaws.com/pusixa/nccn_guidelines_for_metastatic_bladder_cancer.pdf
    • https://s3.amazonaws.com/tutasujal/21185425074.pdf
    • https://uploads.strikinglycdn.com/files/bdefa262-60db-4ee0-8230-dd8662d2e8d3/10749101521.pdf
    • https://uploads.strikinglycdn.com/files/ea0d8ab6-199f-4a8e-8f87-34e087d10bde/bopusatoximi.pdf
    • https://s3.amazonaws.com/boduxatavepe/figavex.pdf
    • http://bibubojudij.rf.gd/how_to_remote_start_car_with_viper.pdf
    • https://s3.amazonaws.com/vonuxagupeduze/13631271451.pdf
    • https://s3.amazonaws.com/zikeko/30122259769.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_off0000ec15.bin
2a43b2d42c2a26b143554dc0cd92037500cadaa354af7b7edc190ce0acca9fdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC15 5288 bytes
font_01_sfnt_off0000fdff.bin
fd27a8eff733631a2f901aa91ac3ecd7292115f800f6dd0dc9ce4ee7ea7e2a5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFF 11112 bytes

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