Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce1205ad41cf492b…

MALICIOUS

PDF

78.9 KB Created: 2021-04-01 22:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6db1182ab9bad06877b1fec1cfba7e26 SHA-1: 8a991f4d49af43646dd8fc481aa640ebbbc1929e SHA-256: ce1205ad41cf492b6146189cec578f3f99cd089427bb7d5a880d15c8eaa8d9f7
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a PDF SEO link farm, with one prominent URL being dafemum.ru. ClamAV detected the file as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of external links suggests an attempt to redirect users to malicious or phishing sites.

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://dafemum.ru/award?keyword=between+and+among+pdf
    • https://cdn-cms.f-static.net/uploads/4490528/normal_5fd7203338a0e.pdf
    • http://youtube-subscribes.com/gre_vocabulary_listfoo6a.pdf
    • https://static.s123-cdn-static.com/uploads/4458826/normal_5fe21d5f4f977.pdf
    • https://bevoparekev.weebly.com/uploads/1/3/4/0/134018333/23e850.pdf
    • https://kogafisefog.weebly.com/uploads/1/3/1/4/131438876/nikubomupodomesofa.pdf
    • https://zimegusak.weebly.com/uploads/1/3/4/6/134605775/9405e9232181.pdf
    • http://card2card-perevod24.site/91054595368qe6wo.pdf
    • http://se-mrush.com/guleregebijegibusetedixi1t5wv.pdf
    • http://lorem.space/bedaguvarasowoxaxofita7gq6b.pdf
    • https://cdn-cms.f-static.net/uploads/4374380/normal_604ccfe85bb7c.pdf
    • http://it50life.pro/1794069054577qkz.pdf
    • https://luruxelu.weebly.com/uploads/1/3/2/6/132682974/korugutatu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/21c8c7c2-3266-4ae8-9758-993ae238f1c3/merkury_wireless_bluetooth_headset_v11.pdf
    • https://s3.amazonaws.com/savukojubusum/short_adventure_stories_in_english_for_class_8.pdf
    • https://cdd249b8-77b1-4a94-b024-8995efe4d959.filesusr.com/ugd/d394ff_8997fab6ccb04bde95a5ceb133c61530.pdf?index=true
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_242c85bd07034651840151c3fc7c0245.pdf?index=true
    • https://s3.amazonaws.com/tikofaketonub/malepajexitevagixirudo.pdf
    • https://s3.amazonaws.com/xisefowu/beirut_map.pdf
    • https://167c8e7b-8160-49a2-a88e-f26749d647c8.filesusr.com/ugd/1ad47d_eda662c20add49b7aaa4fb93ac80dc5d.pdf?index=true
    • https://f3dcd8e3-6656-4b47-a81e-a993d3c4f2a1.filesusr.com/ugd/aa9ef2_c1fec1dc298746159bb59975d7f88397.pdf?index=true
    • https://s3.amazonaws.com/widetunipet/bunakutuju.pdf
    • https://uploads.strikinglycdn.com/files/292cf2c8-6214-4cb0-a8d4-d3699070529c/what_i_was_doing_while_you_were_breeding_barnes_and_noble.pdf
    • https://315736c7-1030-4200-8d24-05c9f4951019.filesusr.com/ugd/d19ca0_8061aff986b94f0ebb64b268d84edc41.pdf?index=true
    • https://s3.amazonaws.com/furunumaroxun/48012082104.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_off0000f812.bin
e3e0d1de91f80ae71ca75b94cc1996d61773847936b12edc9deb8835259abcdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF812 5196 bytes
font_01_sfnt_off000109c9.bin
125b054746dda32aff4fd32d4705a3b7a5f6ea4066e30ef7de215b22872221d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109C9 10828 bytes

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