Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0d0b930783bedb6…

MALICIOUS

PDF

85.0 KB Created: 2021-03-08 11:46:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f3b894faa2d36b4a2c80a1cccc7687b1 SHA-1: 80b35259dbf23783b86e41974bca4af22cf0fd1f SHA-256: d0d0b930783bedb6107ebe315f3565c752cad5db3426b8a5b980ab3c996cf5c8
244 Risk Score

Malware Insights

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

The PDF contains numerous links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The embedded links suggest an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

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
  • 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.
  • 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://yafferge.ru/strik?utm_term=hp+6500+printer+disassembly In PDF document text
    • https://cdn-cms.f-static.net/uploads/4402488/normal_60236c362e1a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387808/normal_603376b2c1056.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473654/normal_5fef887d99f0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419633/normal_5feaeb9328da2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497078/normal_603593b14c875.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_d2394e1cb5f14a13934dbcefb970af74.pdf?index=trueIn PDF document text
    • https://9334512a-4df1-45dc-8804-f0fa1d9e2a3d.filesusr.com/ugd/9466eb_15cfe62cfc264a6fb5d7b3f336a95cbb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d7f4032-3ee1-4dbc-b654-364001c3ed09/wezurifef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d7fc23b-9dd8-4a77-a03e-5b9c5fa639ff/wazefusevo.pdfIn PDF document text
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_5fb14d7518fc4c3abdcb857d47804c40.pdf?index=trueIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_32a0c927cd0d4102a31b64ea57f93f84.pdf?index=trueIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_d25024401b154b07bf80695792613a3d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/2988858880.pdfIn PDF document text
    • https://cd753cf5-d90a-4073-9c55-931a76e81761.filesusr.com/ugd/8826df_98166bf1b03142f891a5d235a8d19487.pdf?index=trueIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_d2f3e5ae35cc4f2188e9a824c696fce0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/db1cf221-efa8-4ed1-9879-1fa706cb6d84/is_there_a_difference_between_sae_30_and_10w30.pdfIn PDF document text
    • https://2d2b1dae-c014-4902-97e6-c3f1d56915cd.filesusr.com/ugd/70e5f7_9550d0e746d24578ba0e53ed97ed44c0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/palevijuj/fegudugufapobibijitorop.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_off0001101c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101C 5728 bytes
SHA-256: c9b245ba3e7e9d58af29bf1ad38f973f8a82bdf831c55b8f304ed1c105345b80
font_01_sfnt_off00012389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12389 10396 bytes
SHA-256: 369a5d6abd74cc1ef937cfd68ae4215db9437823b999f0ff660a988c5b797dbe