Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5104f0380cb2cc…

MALICIOUS

PDF

76.6 KB Created: 2021-03-21 08:22:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 39d1d76d61ebfc5e00d8a78ef01fb888 SHA-1: 6d2a2f50b6bc08bf343b6771a90c2dc8ce8f8af8 SHA-256: db5104f0380cb2cca3e24cdd434b7cecc47a54ff6d7beb02d2d63e2b9d00eb5f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/award?keyword=audit+report+meaning+pdf PDF link annotation
    • https://vumeganutubaxo.weebly.com/uploads/1/3/1/4/131406578/594ab77.pdfIn PDF document text
    • https://cdn.sqhk.co/kuderoxuz/3TF1uif/scandal_interactive_stories_apk.pdfIn PDF document text
    • http://rijebipimaba.getenjoyment.net/gogadi.pdfIn PDF document text
    • https://cdn.sqhk.co/tinupolureg/6yavO02/jigig.pdfIn PDF document text
    • https://cdn.sqhk.co/zimajigon/Sk8Fhgc/89770290253.pdfIn PDF document text
    • https://xadifopelizil.weebly.com/uploads/1/3/4/7/134771643/nilapinuvowutabi.pdfIn PDF document text
    • https://jotulamopusojo.weebly.com/uploads/1/3/4/4/134465369/pefadenobugug.pdfIn PDF document text
    • https://litizabege.weebly.com/uploads/1/3/4/7/134713043/takav-rozefax.pdfIn PDF document text
    • http://sunakijabe.sportsontheweb.net/cell_and_molecular_biology_lecture_notes.pdfIn PDF document text
    • https://resodarapasak.weebly.com/uploads/1/3/4/6/134659305/8067773.pdfIn PDF document text
    • http://sumigemag.mywebcommunity.org/luxumegosavunexesixa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_c6f0b8694f1142fdb80c72872f9c3920.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8d366c3-e742-4bca-9d29-203ef5474022/13216532880.pdfIn PDF document text
    • https://44f39d5c-a655-4437-91b6-62b11e148e71.filesusr.com/ugd/eb4c03_96f4434af2f944a494a7668575f5ced0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/19b166f2-a404-4a3c-99c2-f47c964e2cd0/xeribasosuxefu.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/25699583825.pdfIn PDF document text
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_781ecd3b3677409e852c2886721140a3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pusixa/38338246168.pdfIn PDF document text
    • https://ce55c564-0e79-48ac-bd91-a034cff8554b.filesusr.com/ugd/bd1fc0_3d0cb5340f2441cd9fe37b7f789377c2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1e2fe36-2e70-44c0-bafb-249dab82df69/dirt_devil_royal_103_belt.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_off0000eed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED3 5140 bytes
SHA-256: dc1f7df0223fbdb710aa38473fe3a66b5ebb922d4b63687574b329cd0ae61af6
font_01_sfnt_off0001003c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003C 10428 bytes
SHA-256: 5686b9bba1e15ef3f5df62b826e61390b3c7c4337ed44223090020cde464289d