Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e2cb64a28b32f56…

MALICIOUS

PDF

85.7 KB Created: 2021-06-07 05:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2ac37c9d0063def597cf8f214d5b71a1 SHA-1: 05ebf17017683e076ad9a9486410fba5f618b3bc SHA-256: 5e2cb64a28b32f562ca5d95325597cab2cec15320b3ba72867c13cb391c53058
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting it functions as a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to exploit users via external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://smidgel.ru/pbw?utm_term=tc+application+in+marathi+pdf PDF link annotation
    • https://nipefewemaxu.weebly.com/uploads/1/3/4/3/134387654/ratumutukofidew.pdfIn PDF document text
    • https://mepifinifiwiza.weebly.com/uploads/1/3/4/3/134334375/xazud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379485/normal_6004b37c0e4da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391335/normal_5fc9330e38049.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493553/normal_5fdc0e9ae63b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419410/normal_5fe5e8e0dc538.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390643/normal_60bd4d81ee64e.pdfIn PDF document text
    • https://ragivigelogupow.weebly.com/uploads/1/3/4/5/134525503/a689b23e2.pdfIn PDF document text
    • https://zatagigozot.weebly.com/uploads/1/3/0/7/130775916/wosototinag.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/596cbc85-a2a5-441e-9bbb-8fe513faa663/english_file_elementary_download_free.pdfIn PDF document text
    • http://zufogopojut.pbworks.com/f/english_romantic_movies_tamilrockers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dec8397-2bf2-4feb-8b45-15061946c786/50314189957.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e503634-57fe-415e-8aca-f715d9b8e2eb/whistler_z11r_radar_detector_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6d6cee6-080b-4bec-9cdf-443e20d9373c/43999253215.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/775747bb-8703-4c71-b161-cb7dbf3f424c/63577291397.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11300d18-0a7e-4920-829c-5debbe79f735/72982971780.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ab16b88-6daf-4bfd-9f6a-06c0886051aa/sipizedomabibinifaveweb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f83dd9a-3c5f-4fc9-ab6d-64e56c0d437a/medical_certificate_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ddb9c2d-2d70-4775-b7e3-d0fd3e92eedb/36091408372.pdfIn PDF document text
    • http://jolunatimavu.pbworks.com/f/fusokab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cab620d1-de57-4536-bad3-57229f923edf/lawenuwijodukinenejimuki.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_off0000fb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9A 5164 bytes
SHA-256: 97a9aa9877de10f462892d4a2fccd191f394de3ba86ab2969cea8e922fa7c960
font_01_sfnt_off00010d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D02 10932 bytes
SHA-256: 15878132e054bc35a1465b88bfaaad73f4916e5ea7b24fa6eeaa06a97d4dec62
font_02_sfnt_off0001329a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329A 16172 bytes
SHA-256: 7f268005b80ff82e89639affb95403f55eddb42516abbde6a76e27226db124cd

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