Malicious PDF — malware analysis report

Static analysis result for SHA-256 38db5d9bc37418e6…

MALICIOUS

PDF

81.4 KB Created: 2021-04-02 05:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c89b1f38a4985fe625d5d80732f8acc2 SHA-1: 1e36b9e4bc2384901e3af44d912660473fe41a34 SHA-256: 38db5d9bc37418e62c084ca75f878e402fc8babef82adb5313740f0fc8870cb0
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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=2015+jeep+wrangler+maintenance+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443337/normal_5fe63dc32358a.pdfIn PDF document text
    • http://zelumefepa.sportsontheweb.net/telecharger_dictionnaire_oxford_anglais_francais_gratuit.pdfIn PDF document text
    • https://cdn.sqhk.co/sativomofij/jfRifje/sedox.pdfIn PDF document text
    • https://dazuzezabemor.weebly.com/uploads/1/3/1/3/131380892/jukavalemivilid.pdfIn PDF document text
    • http://kexolifowuj.medianewsonline.com/99803062638.pdfIn PDF document text
    • https://dofazodasi.weebly.com/uploads/1/3/0/8/130873943/fc4d1c191e9ebc8.pdfIn PDF document text
    • https://cdn.sqhk.co/gopuxipo/hgOTygf/super_adventure_land_denver_colorado.pdfIn PDF document text
    • http://kopogaxepaku.sportsontheweb.net/mavenozedek.pdfIn PDF document text
    • https://vazatevetag.weebly.com/uploads/1/3/0/8/130874289/mosajawabejozuxamip.pdfIn PDF document text
    • https://fimosezit.weebly.com/uploads/1/3/0/7/130775491/709875.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464301/normal_605a598a2d07f.pdfIn PDF document text
    • https://bapuporodotuxo.weebly.com/uploads/1/3/1/3/131381531/jadiragotufokemada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413000/normal_6023143e8f261.pdfIn PDF document text
    • https://xoxawipexari.weebly.com/uploads/1/3/0/7/130775732/timedipujajis_dogezutuxufomez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527237/normal_60558cb5967a8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_ced79afa04714f80ada42192ce57c064.pdf?index=trueIn PDF document text
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_ec99da115f72486895255a4e84e449a5.pdf?index=trueIn PDF document text
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_8858005ea7834dd693a3e83138204f08.pdf?index=trueIn PDF document text
    • https://0443db59-9f9d-4031-b786-8a5723798135.filesusr.com/ugd/ab62d6_cc0be89d2bc146e0bf6b90867765b402.pdf?index=trueIn PDF document text
    • http://bilisedutave.myartsonline.com/vijufesegajeg.pdfIn PDF document text
    • https://09d56968-2ae9-412d-ad86-e67dc63a1c23.filesusr.com/ugd/e8b91f_8fbbbab775f4483a91cafbdbd284c87b.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBD 5372 bytes
SHA-256: 3249a0446dbac07b9542d70463a605ab9cd554f18cf222f4b744ea1c11e290f3
font_01_sfnt_off000101f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F7 11740 bytes
SHA-256: 963f1cbb596e95494c3ed4511b6bc046c377b4c6612189ff26662f98e2b82009
font_02_sfnt_off00012a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34