Malicious PDF — malware analysis report

Static analysis result for SHA-256 39b360fc1495e94f…

MALICIOUS

PDF

84.6 KB Created: 2021-03-25 09:43:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d06e3a44f5519243bedae6778ac7aca SHA-1: 26364af4b41918a77108f86d5958e984b256719a SHA-256: 39b360fc1495e94f2f543b5bec46461b38fd70c1c75aefb072af2217419e286c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a PDF link farm. One of the primary URLs points to druttle.ru, which is suspicious. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malicious content through the link farm. No scripts were extracted, but the structure suggests a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/123?utm_term=second+boer+war+uniforms
    • https://static.s123-cdn-static.com/uploads/4471083/normal_5fff7db1d93d0.pdf
    • https://static.s123-cdn-static.com/uploads/4489713/normal_5fefbed45c1f1.pdf
    • https://cdn-cms.f-static.net/uploads/4422918/normal_605182ad9262c.pdf
    • https://static.s123-cdn-static.com/uploads/4452389/normal_6005011ff2513.pdf
    • https://cdn-cms.f-static.net/uploads/4403264/normal_601e61e6e57e6.pdf
    • https://cdn-cms.f-static.net/uploads/4476281/normal_5fe77df8661be.pdf
    • https://cdn-cms.f-static.net/uploads/4403952/normal_602e99e64ef27.pdf
    • https://maxedojose.weebly.com/uploads/1/3/1/4/131452800/rodov.pdf
    • http://hotita.space/wajeges4jhh7.pdf
    • http://pl50off.info/28150982157r5wps.pdf
    • https://jimilosebot.weebly.com/uploads/1/3/4/0/134096588/tabarofaza.pdf
    • https://static.s123-cdn-static.com/uploads/4419629/normal_5fcb5242a0606.pdf
    • http://copyright-notice-ig.com/chiari_malformation_mri_sequencesq0spq.pdf
    • http://intekzafast.online/exploratory_data_analysis_techniques_python5o3gj.pdf
    • https://cdn-cms.f-static.net/uploads/4443594/normal_600f27d72e3fc.pdf
    • https://static.s123-cdn-static.com/uploads/4408720/normal_60034f1373458.pdf
    • http://monongzhlh.space/juwotonuvamuhjk10.pdf
    • http://pipvip.ru/wifi_file_transfer_apk_for_pced55g.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3ea38e3a-cd18-4515-8555-55c94c668c8c/how_to_connect_my_hp_2542_printer_to_wifi.pdf
    • https://uploads.strikinglycdn.com/files/bf0fe428-413b-4d61-84ba-37e1c87ab2de/how_to_write_an_introduction_paragraph_for_3rd_grade.pdf
    • https://uploads.strikinglycdn.com/files/13a34f31-fa17-4c86-8722-1ea11091a72b/how_to_find_hidden_photos_on_iphone_6.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_off00010e82.bin
67d8aa0dc0cf83d4b594cb7257e7ddb9f7be5eab3d4b75f50f127059004280a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E82 5468 bytes
font_01_sfnt_off00012115.bin
b450864aa56f52ace01dc8f401e388de1724d188e9e295fc00ef65669d157e5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12115 10732 bytes

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