Malicious PDF — malware analysis report

Static analysis result for SHA-256 573d4bb2bb232485…

MALICIOUS

PDF

119.6 KB Created: 2021-03-25 06:10:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9719292c02706576b6596f28dc50248 SHA-1: 7865f9246359822ef2e22a1c52f49fe492101b1b SHA-256: 573d4bb2bb2324857f0427da7693393967af1cbbd89a3c5832420382fee6cc12
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. It contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to lead the user to external resources, potentially for further exploitation.

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-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://druttle.ru/wix?keyword=quadratic+optimization+problems+worksheet
    • https://cdn.sqhk.co/tamurikubol/gjggdwz/geluvuvikarigesexo.pdf
    • https://cdn.sqhk.co/gegefemorosu/jCvhbTA/mi_telcel_paquetes_internet.pdf
    • https://cdn.sqhk.co/wuvupalib/39gj1O7/gezojasinumivuvez.pdf
    • https://cdn.sqhk.co/vumusokutil/5qCgcjh/zujetojidesis.pdf
    • https://cdn.sqhk.co/wuluzajiroz/QEgiPjh/vokoziboxobog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_05ea0e89e7ef458fbe28d1c138818820.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e8384dd7-2093-4703-8928-7c90bc091954/bivip.pdf
    • https://uploads.strikinglycdn.com/files/fe4c3e66-8d1f-402e-bb67-4e0eef4fda52/mepumavarexezajezapuviru.pdf
    • https://73b3f487-90f5-41a6-bf44-750372f72efd.filesusr.com/ugd/39e8d0_08aaff5b789443e9956b541a58362f95.pdf?index=true
    • https://uploads.strikinglycdn.com/files/02c1cb85-2ec0-41fa-a646-01efd2dab9fe/varilori.pdf
    • https://c78267de-509c-4cb0-9394-6b21b7876e04.filesusr.com/ugd/290ce3_39843f0b190349e9ad5c8b3ec0049787.pdf?index=true
    • https://uploads.strikinglycdn.com/files/48cdc569-05f8-41b6-875d-a2d464747ac7/suwoli.pdf
    • https://uploads.strikinglycdn.com/files/41b05f94-bd39-49a6-88a8-757b70f51036/how_to_build_mental_stamina.pdf
    • https://uploads.strikinglycdn.com/files/c2bc3e36-b980-4e85-964d-a48367a84cec/3134090380.pdf
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_cd172fc5a0b7496eaff7f3bca29b948c.pdf?index=true
    • https://6090ae5c-070c-4b50-bfd2-11a66789f099.filesusr.com/ugd/83cce3_671203842e32462686e77632555b7142.pdf?index=true
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_cf8fc9460a694274b54c8974efa1a768.pdf?index=true
    • https://uploads.strikinglycdn.com/files/35c5b295-7a20-47f3-a85a-065bbe287ff4/constitution_ged_practice_test_illinois.pdf
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_a1b71a3afb784888ae18dfc3463ee9b9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fd63bba2-f80f-48ab-8772-186eabb60d3e/35515204273.pdf
    • https://uploads.strikinglycdn.com/files/ef0b52c0-d81b-452b-8375-95c05c0866de/joyetech_evic_vtc_mini_atomizer_short.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_off00018d98.bin
c1dd3ad1f9ed2b7ade1b388b2bf2c0c5fb24a2a10491a307d6c7f3140b2c1854		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18D98 5604 bytes
font_01_sfnt_off0001a082.bin
5c17e107c408c07cd2d92a176ebb11bc3acaac4f2b48d2fa1eeb3ae3df197e91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A082 10004 bytes
font_02_sfnt_off0001c25b.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C25B 4324 bytes

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