Malicious PDF — malware analysis report

Static analysis result for SHA-256 42807b921fbc3570…

MALICIOUS

PDF

81.6 KB Created: 2021-05-14 14:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 9c78e4e8e3df98aee12a4e46234ffaed SHA-1: 9a1e126b3495d7d1913db14e6392a9d2f524afbc SHA-256: 42807b921fbc3570720ac9141951fd2cee76b5c4d63807a0dfb7e5a23b015461
252 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting and redirecting to malicious infrastructure, as indicated by the PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics. The ClamAV detection and ML classifier further confirm its malicious nature. The document body, though heavily obfuscated, suggests a lure related to AutoCAD content, likely to entice clicks on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=how+to+draw+sectional+view+in+autocad In PDF document text
    • http://ideaita.fun/85829074118uotcg.pdfIn PDF document text
    • https://dekedenavit.weebly.com/uploads/1/3/4/6/134612093/8089460.pdfIn PDF document text
    • http://instahelpforbusiness.com/kuwivaribalomawuvisozeocky.pdfIn PDF document text
    • https://kuxozofaxaxasij.weebly.com/uploads/1/3/5/3/135325708/0cb5c9e3aed8dd0.pdfIn PDF document text
    • http://espacecmb.xyz/wisegixamafefisaxainf26.pdfIn PDF document text
    • http://limecash.xyz/banjo_kazooie_spiral_mountain_sheet_musicjpjxo.pdfIn PDF document text
    • http://podcard2020.site/33673792717p46uz.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://uploads.strikinglycdn.com/files/9ae92e51-c476-4adc-a7a3-26264e389588/sunozesirame.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4318415c-dbfe-4736-bbb3-7d11fec96147/21348425605.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12ad62f0-bec7-490c-b09e-27cd584b247a/a_temporary_matter_short_story_summary.pdfIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_7a95b9f56b734ba8b23681892e74cf07.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e962a31-4c6f-49ea-90e7-f28488197441/pretty_little_liars_book_3_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ac7f216-ce97-4baf-a5e6-bff3320189c2/kefepemubariwizaviregi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bd7493b-6519-41fa-ae58-e0a58e56d75e/75245269177.pdfIn PDF document text
    • https://6196a4e6-b3b5-4a85-a139-4ec84e0a53d9.filesusr.com/ugd/d01287_c5fbf09c9b634cde900979049e908c49.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/201c374b-009e-4cc8-81a9-4c323b3b2f70/wazagidanupuwif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fd03f3e-8a67-4ac1-ba42-45679e3c1e7f/gosoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd607be3-e73f-4577-a819-917ae7e2af9e/86121902536.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e4d07e9-ad99-45fc-86c4-12846db1207e/ditetitu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0709239-6981-43c2-88ad-fe375827d8c9/farewell_to_manzanar_chapter_1-5_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc546ca2-a39b-4635-b0aa-3366226ab8c6/rotoropozuzugidejojolim.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D7 4928 bytes
SHA-256: 9a4001b70b3921c883306e759cae9cc55a08786de4087c47d2b2717268176ae6
font_01_sfnt_off000103b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B7 10904 bytes
SHA-256: ac2dbadcadbb6b2a307ac4cea91761ee16fb282e7da01bbe7d437fd0332a5c7f
font_02_sfnt_off000128e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E5 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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