Malicious PDF — malware analysis report

Static analysis result for SHA-256 d95891101230b14a…

MALICIOUS

PDF

89.0 KB Created: 2021-03-29 07:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 28a7f84dc30a521451632ec087e8d1f0 SHA-1: 20699dae3528413e0775d13e4b3df76b2485a44f SHA-256: d95891101230b14a86aadedf0ca547ce1dad2f3835c0fa4643d853321be3069d
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a clipboard-command (paste-and-run) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://lozipotod.ru/strik?utm_term=how+to+setup+zebra+gk420d+on+mac PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4477401/normal_5fe38147ab123.pdfIn PDF document text
    • https://cdn.sqhk.co/talexadu/NFRiahj/11159864879.pdfIn PDF document text
    • https://cdn.sqhk.co/tisorobew/CijjixT/muzegagekidix.pdfIn PDF document text
    • https://cdn.sqhk.co/fasisela/tjffUja/velaximele.pdfIn PDF document text
    • https://cdn.sqhk.co/pagupuxu/igdibLM/39121173692.pdfIn PDF document text
    • http://gekatigemebosen.iblogger.org/tigavewoj.pdfIn PDF document text
    • https://cdn.sqhk.co/fapewakuw/cTJjdmO/37133484312.pdfIn PDF document text
    • https://cdn.sqhk.co/takoxuwal/fhcVlp5/zonodukimaperavupive.pdfIn PDF document text
    • http://jinoxiresajigeb.iblogger.org/pelevevinuziguxofo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402533/normal_5fd22e2d4cfd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424036/normal_60552817a69b9.pdfIn PDF document text
    • https://cdn.sqhk.co/xonepogafix/jipNjiB/electronic_drum_set_price_in_bangladesh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://591379ed-26d0-4405-baa7-5b8dadede013.filesusr.com/ugd/866ffa_0fbf694d512e43669df71aee9d12f17d.pdf?index=trueIn PDF document text
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_e7014035d1214508bb024c7b09d918d4.pdf?index=trueIn PDF document text
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_5a797cebab37416c9b25c3f438e5f135.pdf?index=trueIn PDF document text
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_a5f63962042c4cc5bda7026908362552.pdf?index=trueIn PDF document text
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_af6eab683f8a4e7f8d2b4740ed68b66c.pdf?index=trueIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_2e8cf7436e524cd89bf3237a699d9cbe.pdf?index=trueIn PDF document text
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_67316c19a274426981fa344226323459.pdf?index=trueIn PDF document text
    • https://06b91503-bda4-4bbd-a69c-520552d4e402.filesusr.com/ugd/07c5d0_792f97b56e5849489cccaf795974a9ef.pdf?index=trueIn PDF document text
    • https://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_98861efe3eb34c12bde7d70e8ba0d4bd.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF716 5864 bytes
SHA-256: 7abb94839f9a9a32b5ae4e0709dc2a4ceb3ac969ed12e4a2d59ee9d9856815a8
font_01_sfnt_off00010b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0D 11904 bytes
SHA-256: c445f6b468291029c7a5b22e52b34e825b56e886eb5b1f04812a4a5557a17bf4
font_02_sfnt_off000132eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EB 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15
font_03_sfnt_off00014819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14819 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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