Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5cc40bacb8bfce2…

MALICIOUS

PDF

85.6 KB Created: 2021-03-31 12:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: eca6245d0398fbbb3d4a1df1f65ee59e SHA-1: e99c11a1414dcdde31c5361a59cc09937b300a97 SHA-256: a5cc40bacb8bfce2721c20c62b4e7842b62aa41daa160bd047b12ec077fb2de6
226 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste content into a shell, likely to execute a malicious command or download a second-stage payload. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ponafet.ru/wix?keyword=solution+set+calculator+matrix PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4492574/normal_5ff858496ff69.pdfIn PDF document text
    • https://saxepuxuk.weebly.com/uploads/1/3/4/4/134472003/3394199.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412181/normal_605f3bbae4c6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410002/normal_60376397402ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384316/normal_601ba7db86a8a.pdfIn PDF document text
    • https://kutemipemowu.weebly.com/uploads/1/3/4/8/134860595/wufizez_bomijuri.pdfIn PDF document text
    • https://zuvopiramalatug.weebly.com/uploads/1/3/5/9/135981479/japuwogiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479923/normal_6052af8fa6cbb.pdfIn PDF document text
    • https://gutusalewizewuj.weebly.com/uploads/1/3/1/8/131871657/kumuwoso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393022/normal_5ffc11a573d94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468831/normal_601d9297e6647.pdfIn PDF document text
    • https://nasoluludeg.weebly.com/uploads/1/3/4/4/134435301/9466888.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502500/normal_6056e492f2853.pdfIn PDF document text
    • https://botapafejerevim.weebly.com/uploads/1/3/5/3/135317081/1641587.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501201/normal_602b93b5cd0a4.pdfIn PDF document text
    • https://vimedijo.weebly.com/uploads/1/3/1/6/131606629/2bf382929700.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369802/normal_60065a41716df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404113/normal_6061f95a8f4e8.pdfIn PDF document text
    • https://lidafeli.weebly.com/uploads/1/3/4/6/134683499/2921854.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/43305b3c-a9ca-47aa-ae50-833b43f67f17/birelukot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1cc5f47-38f2-45c7-89f8-d182c21179b0/major_events_in_us_history_after_ww2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d37c30fa-2ca0-48bc-aa63-f642ddbf6658/kileso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5090f2f7-eb82-4f2b-9434-537cc5eb62b8/gegenotobek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31f185a6-a9c7-455e-a68c-d55fdf05c640/22491061589.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CB 5116 bytes
SHA-256: 36a141c9edc1e04de4313f6afd1612d2643db53527ed46aea08eb20063b15ee8
font_01_sfnt_off0001051c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051C 12628 bytes
SHA-256: 33f5f3f28435a819ed761659a9dcde03736164f1dce8158d3d931f2e116ea6cf
font_02_sfnt_off00013052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13052 16624 bytes
SHA-256: 9d161ac400470f0a1be7f56a4847e1f2b9b66b986ef92907a214ca6ec31967f4