Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8bd34fe0beed7c3…

MALICIOUS

PDF

77.8 KB Created: 2021-05-28 00:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9a3e8d3637193a30c52ec41a538e3a49 SHA-1: c8b742f54999c130216b0ad57a9d12f22484bf9e SHA-256: f8bd34fe0beed7c329a8d95958ca0011958c3a1b17b50d31f3d039407ff1a5d7
226 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. It uses a password-protected-archive lure. 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 0.9997

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://seumenha.ru/strik?utm_term=propel+star+wars+tie+advanced+x1+battery PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375204/normal_603bece73c5f2.pdfIn PDF document text
    • https://givovirudodax.weebly.com/uploads/1/3/4/5/134587764/3902901.pdfIn PDF document text
    • https://zinadilijisud.weebly.com/uploads/1/3/4/6/134619113/gonigafemiwumu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414867/normal_5ff68893ce203.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388037/normal_5fe0b1cbc560e.pdfIn PDF document text
    • https://nopifabuda.weebly.com/uploads/1/3/4/6/134693299/9c7f26.pdfIn PDF document text
    • https://luzidasagozoro.weebly.com/uploads/1/3/4/3/134319964/2708006.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469350/normal_603445b67cc9d.pdfIn PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/vukodujexufusi.pdfIn PDF document text
    • https://removevas.weebly.com/uploads/1/3/4/4/134443453/xizomudetilusun_mapunerid.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/244e3b48-8583-44db-8122-962d8db92eb4/12597943369.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5e7723a-edb9-4da3-9fd6-e966a3175001/contrast_dna_and_rna_molecules_sort_each_item_into_the_appropriate_bin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03ecf31d-051c-4713-a2b8-6c4e3904cfbd/wubezilibudabuxodid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61c2e65c-7b60-44d4-bb39-3d2cc5fbb64b/kexapobotikomevunexamezut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ea6a039-d5a2-43a7-b64a-a0e813b13a63/besem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf40719a-4089-48ae-bed7-9a1e2186416b/what_is_nuclear_fission_in_physics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/409712da-dba5-4c78-a318-b85f92931649/what_is_cyberpunk_2077_coming_out_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/281690c0-1c0f-408b-96f4-7bb04160068e/pezub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd3d92bd-bd37-4eb2-822f-37e7da3fbe14/who_is_the_slimmest_actress_in_bollywood.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6cd6251-6572-4bca-80ba-f42fb131d106/zabas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6870277-a27c-449e-a220-7b19ac670fdc/farfalle_pasta_with_sausage_recipes.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_off0000edce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCE 5580 bytes
SHA-256: d5b399e5f650004b4e54ab5b94445f57c3d12bf701011315a32419750a2b4cea
font_01_sfnt_off000100f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F5 12492 bytes
SHA-256: 7fdd97e3571302d2bc32a6130276108afb363c0b174b91505e3e15a9a42eac52