Malicious PDF — malware analysis report

Static analysis result for SHA-256 7de3821b45b5a3dd…

MALICIOUS

PDF

75.2 KB Created: 2021-03-14 16:34:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ab14ef9622984ec1c1327a8e6f24757 SHA-1: d7c2e119005c31637be95d9d8b909ce273181465 SHA-256: 7de3821b45b5a3ddf08e4ffbbf56ea934a75075ed99ab3f73614441849fd6ea6
156 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing or malicious link farm campaign, as indicated by the 'PDF_SEO_LINK_FARM' heuristic and the presence of numerous external URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to harmful sites. While no scripts were extracted, the document's structure and embedded URLs point towards an attempt to exploit users through deceptive 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/award?keyword=german+learning+pdf+file
    • https://guwizufim.weebly.com/uploads/1/3/0/8/130813931/742e2a1d0.pdf
    • http://zegererevez.medianewsonline.com/equidad_de_genero_nios.pdf
    • https://fuxesofana.weebly.com/uploads/1/3/4/1/134108907/volan.pdf
    • https://fimekubolutad.weebly.com/uploads/1/3/4/5/134585071/kafagakebipade.pdf
    • http://biwedujurar.mywebcommunity.org/biophilic_design_book.pdf
    • http://mikazuxo.mypressonline.com/74700022444.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_d4857d3e429f4138b84f6fd84c42cf4f.pdf?index=true
    • http://mekigif.epizy.com/landing_page_website_template_themeforest.pdf
    • https://s3.amazonaws.com/womirofop/guided_walking_tours_iceland.pdf
    • https://8488b7ac-84bc-45ae-88ed-26841205fc59.filesusr.com/ugd/7cda3c_6eabc17e9e294140a7ca1f1fc0012c74.pdf?index=true
    • http://sikofus.epizy.com/74482041320.pdf
    • https://s3.amazonaws.com/wuzalugiseto/piriformis_syndrome_sciatic_nerve.pdf
    • http://fasilew.epizy.com/rufanuzidoxuzedineke.pdf
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_9d0f2a0659f64d829290cdb3c68d4a71.pdf?index=true
    • https://s3.amazonaws.com/minabiwa/fiwedudozamugolibiruf.pdf
    • http://gebefamudusefo.epizy.com/dell_optiplex_760_ram_type.pdf
    • http://tuludipetowizad.rf.gd/32572072328.pdf
    • https://s3.amazonaws.com/julaxel/47438642771.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfbf.bin
2002188c6c351ef3c887fa9086b89d8cd128fa2c1addc421fc98fddf39c6da29		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBF 5216 bytes
font_01_sfnt_off0000f15f.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF15F 1800 bytes
font_02_sfnt_off0000f9ed.bin
24477638314c33318ae4fab97a809c375b10cf13d52e800e669df376c12ef02f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9ED 11036 bytes

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