Malicious PDF — malware analysis report

Static analysis result for SHA-256 df46fe733724ed82…

MALICIOUS

PDF

78.8 KB Created: 2021-05-31 06:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: cc3394c146a8810654c363aad8a86116 SHA-1: 8f40ef7a3916010a1d43ca592ee68a89b42dd6a7 SHA-256: df46fe733724ed828dd7dbee1c7f4f34d7f2384ab3862ddd0bd138b25cf58751
186 Risk Score

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://midufefew.ru/strik?utm_term=how+much+is+scrap+copper+worth+a+pound PDF link annotation
    • https://pitinolulisam.weebly.com/uploads/1/3/1/3/131381612/fiwikezis-jenukizir-puvagedodeji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413578/normal_602ea748ea1d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379855/normal_604759c5d868a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473638/normal_6040dcc87c9c3.pdfIn PDF document text
    • https://nojupifidupo.weebly.com/uploads/1/3/4/3/134361410/2241698.pdfIn PDF document text
    • https://welabelodaset.weebly.com/uploads/1/3/5/3/135399274/2154233.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393019/normal_60039a2127f37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463287/normal_60494fc639075.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448724/normal_606e4448f3cc4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483104/normal_5fed50f867e15.pdfIn PDF document text
    • https://wofuzokekaxan.weebly.com/uploads/1/3/4/4/134465278/rirexi_xuviruzulasizu_savelag_gamopomebosofot.pdfIn PDF document text
    • https://tevupiju.weebly.com/uploads/1/3/4/8/134865653/1543531.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/d96f1c60-9a11-4b5d-9a89-dae0cfffc0c9/thema_mathematik_1_lsungen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58225e1c-c02b-48c0-bdd1-58e95e7cbfcc/jump_force_ps4_gameplay_2_player.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b406ae92-24ba-4fbc-977e-3b6975f3fce9/how_to_stop_indigestion_and_acid_reflux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c21a6f7-82c7-4b9b-8fc0-d28d0e629af7/vewope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21d2c7cf-a72e-4a4e-aa1e-7712b332ad76/circulos_armonicos_de_guitarra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b07300b0-b710-4403-9e11-9e084769c2a4/autocad_tutorial_free_download_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88afdb17-90c5-4271-93df-2941aba002ac/88577520743.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e4252cb-f81d-4acd-9e6e-111d9b345525/everquest_leveling_guide_2019.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_off0000f679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF679 5332 bytes
SHA-256: 2b461d9221864a6f3b5ea0c5b41bd9c9871879ba045d0230d1f3e09cca71633e
font_01_sfnt_off0001087e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087E 10912 bytes
SHA-256: 8a9bd9939dd4ae0ea7bd5f2087237b2d89aad3e9abf773c3e9befeb45f821e71