Malicious PDF — malware analysis report

Static analysis result for SHA-256 7417f3b423081f04…

MALICIOUS

PDF

88.8 KB Created: 2021-05-31 02:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 108eb8f298086a75c82a0e2c69ae8ff8 SHA-1: 1185ea9b88dfab2c49d59981c9bacd92f273eb99 SHA-256: 7417f3b423081f04a44026b42b41c1a5be82a8cba736f61e3aacd02751776a42
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=pirate+bay+proxy+serbia PDF link annotation
    • https://mozovarowojexi.weebly.com/uploads/1/3/4/8/134867055/9f8843c34d3.pdfIn PDF document text
    • https://mululugasafes.weebly.com/uploads/1/3/1/6/131636627/gufukase.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426279/normal_5fe1d2ed14424.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408355/normal_6038834414df5.pdfIn PDF document text
    • https://kolekidir.weebly.com/uploads/1/3/4/4/134441437/fosipexofivodoj-widojam.pdfIn PDF document text
    • https://pumaxodevuk.weebly.com/uploads/1/3/1/8/131872084/8601554.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421776/normal_5ff9204221a99.pdfIn PDF document text
    • https://zonepebitebebo.weebly.com/uploads/1/3/4/3/134369254/lokikatofefunafax.pdfIn PDF document text
    • https://faxulifil.weebly.com/uploads/1/3/4/7/134731484/8964642.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413113/normal_601d73ad1eedc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413231/normal_5fd09c2d716a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450240/normal_606911075ef9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419001/normal_601b1230588af.pdfIn PDF document text
    • https://nukarefu.weebly.com/uploads/1/3/4/1/134131348/zulofenuwurog.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4378406/normal_60b4097296c43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404741/normal_6042ccc23fd37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496151/normal_603ec8ed41160.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://uploads.strikinglycdn.com/files/5fe2d086-176a-4037-bb25-5ac88080438d/53814896740.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfa5ea9b-0b6e-4b1d-8259-987995d5bca1/persepolis_pelicula_completa_en_espaol_latino_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8658e89-cc5a-4ec2-a96d-504c7daa8491/what_is_the_best_electric_pressure_cooker_to_buy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd491af8-ba32-4e57-a487-a21c0d240635/jowusunelogegupuvuwozeti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d9a171d-3578-4240-a104-e362a7483a69/gakulanezolopoziboxideg.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11336 4776 bytes
SHA-256: d2e1b65f9c36efe1ab043a3487fd8c53eb96ac9e84e241e36320f238dacebb50
font_01_sfnt_off0001237e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237E 10740 bytes
SHA-256: de6aaaa4669de2116fb19d3c1971069897216d4577a6221c04bfb27c3a5571e7
font_02_sfnt_off000147e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147E7 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2