Malicious PDF — malware analysis report

Static analysis result for SHA-256 d433a7a74966bdb7…

MALICIOUS

PDF

91.8 KB Created: 2021-04-01 05:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 72456c5395d1b34223959d568d5dbcdf SHA-1: e2459218ba9e115cbdd15769d5c01683d2874619 SHA-256: d433a7a74966bdb7ca1ff634b8ee832c6407a4305a944e48cf9d425bd7f5c19a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9998

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://dugedepap.ru/123?utm_term=pay+slip+sample+template PDF link annotation
    • https://butusokusumowa.weebly.com/uploads/1/3/5/2/135294155/4033148.pdfIn PDF document text
    • https://zofafekolabu.weebly.com/uploads/1/3/5/3/135301669/kaxis.pdfIn PDF document text
    • https://tugojomabam.weebly.com/uploads/1/3/4/5/134588125/6c8c579f2.pdfIn PDF document text
    • https://kulojimafad.weebly.com/uploads/1/3/4/5/134518235/lalumemukeris-rubenewisuzus-fesixewubuza.pdfIn PDF document text
    • https://bijivabaj.weebly.com/uploads/1/3/4/6/134601785/1088498.pdfIn PDF document text
    • https://jorobeperepi.weebly.com/uploads/1/3/1/8/131856290/zimaxapubuna.pdfIn PDF document text
    • https://boxagabopevonud.weebly.com/uploads/1/3/4/3/134353696/9057779.pdfIn PDF document text
    • https://tizemafuniture.weebly.com/uploads/1/3/4/6/134636649/dowizaxili_jekupo_kuretiwewewabu_menowijug.pdfIn PDF document text
    • https://vojubewerele.weebly.com/uploads/1/3/4/0/134013512/xukuraditupep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_e822725a32294f3d87fd416abc3e0609.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jiwisi/45168829218.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f233dbcd-9ae7-45c4-88cf-4087f21464ab/53751386585.pdfIn PDF document text
    • https://4dd4a32c-aced-41d2-87e6-7ff9ca8080d7.filesusr.com/ugd/6d6f33_e714e9c3687945149fa18b448c4ecbe5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbd7c715-985f-4409-bc0b-5481632ef99f/92661910720.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b8b6d16-0608-46b5-8d31-be3f347a2fb9/vowub.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/say_something_piano_sheet_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/landis_gyr_e110_data_sheet.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001296b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296B 4972 bytes
SHA-256: ad3bda0a27b113d02ff741805c2e722eaaad038fb6a1f7ded0998297d4c50ec0
font_01_sfnt_off00013a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4E 11392 bytes
SHA-256: 4b3a137001014fed9a553dc1276994e41269f9ae4d1cfee16c0dbfea322091c2

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