Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b2326d799119028…

MALICIOUS

PDF

87.2 KB Created: 2021-03-18 05:17:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f88607320bb00899a4f7d467a0f8212c SHA-1: b087fbf4336dcdb2930defb8ab55b9142f2bcfbf SHA-256: 0b2326d799119028cfde43a3338c341fedc9a03054b70a464f712a9c93d53d7f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/award?keyword=australia+zoo+map+pdf
    • http://weridif.medianewsonline.com/the_pit_and_the_pendulum_assessment_answers.pdf
    • http://sipikiwip.iblogger.org/fake_medical_report.pdf
    • https://konezevebul.weebly.com/uploads/1/3/1/3/131381420/rukur.pdf
    • https://bakadowo.weebly.com/uploads/1/3/1/3/131380427/4184080.pdf
    • http://xufopizaxeto.medianewsonline.com/quotes_about_life_and_happiness.pdf
    • http://jajokojunewi.mypressonline.com/sagisewowipuk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://megigezorozo.atwebpages.com/weight_loss_exercise_in_tamil.pdf
    • https://s3.amazonaws.com/luborinizu/toshiba_dr430_dvd_recorder_manual.pdf
    • https://s3.amazonaws.com/jojitagifuva/6522090145.pdf
    • https://s3.amazonaws.com/sikuva/79835232411.pdf
    • https://s3.amazonaws.com/jawusawar/how_do_you_block_caller_id_on_landline.pdf
    • https://s3.amazonaws.com/fowonaxul/gamalaso.pdf
    • http://selosaxugi.epizy.com/menalideritupawikinepexev.pdf
    • https://s3.amazonaws.com/mikibetiv/ansys_19._2_user_manual.pdf
    • https://s3.amazonaws.com/pukiza/35497964061.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_off00011899.bin
91200b014ae1160df031acca9c0d2ba9d3b1713ebf006b68ebb5e926e64aec6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11899 5224 bytes
font_01_sfnt_off00012a54.bin
9def5f7d3e36cc9e7164745da8c2d9f596509e27aa95f41058abd78165ca7df8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A54 11096 bytes

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