Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4fe4c49d5816b50…

MALICIOUS

PDF

86.4 KB Created: 2021-03-23 23:50:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 6c6f77549db365148fecd9a7eded07ee SHA-1: 950a4c732539b40fa07475f3c065649394b87c27 SHA-256: f4fe4c49d5816b50347dcc363aae7071b939bfbda53eb29f3dbad05cfb087c9a
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, forming a link farm designed to direct users to various websites. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a strategy of creating many links on disposable hosting, likely for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, with the document body containing obfuscated text and metadata pointing to a lure related to 'Barbara cartland novel pdf'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://zajinet.ru/award?keyword=barbara+cartland+novel+pdf PDF link annotation
    • https://bumesusibob.weebly.com/uploads/1/3/1/8/131857970/eca25debc7bdac.pdfIn PDF document text
    • https://pomitowu.weebly.com/uploads/1/3/4/3/134389192/024707158e4.pdfIn PDF document text
    • http://ellmax-site.xyz/nezijidoth0sph.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452846/normal_5fd2c4b0cd96f.pdfIn PDF document text
    • http://semengergel.ru/20790580507fcyp6.pdfIn PDF document text
    • http://shoppingyxplus.xyz/planet_coaster_career_guiden6x3b.pdfIn PDF document text
    • https://xopubisewono.weebly.com/uploads/1/3/4/5/134507782/nufutedawusilovaw.pdfIn PDF document text
    • http://yourdesk.website/adobe_illustrator_and_photoshop5ssse.pdfIn PDF document text
    • https://witabavuwimob.weebly.com/uploads/1/3/4/3/134339013/8901016.pdfIn PDF document text
    • https://jedidaril.weebly.com/uploads/1/3/4/6/134687024/5421928.pdfIn PDF document text
    • https://famonusowofem.weebly.com/uploads/1/3/4/3/134349488/84b575552bd866.pdfIn PDF document text
    • http://wulurag.mygamesonline.org/apostol_calculus_vol_2_download.pdfIn PDF document text
    • https://wiwetone.weebly.com/uploads/1/3/4/6/134660192/cc114.pdfIn PDF document text
    • http://narawodosure.medianewsonline.com/vejamobunexul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408582/normal_604e0ab9b3220.pdfIn PDF document text
    • http://gekodejevotug.medianewsonline.com/70269813785.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453729/normal_5fda2f0d03bce.pdfIn PDF document text
    • http://dinewegivogofe.mygamesonline.org/49792450686.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415930/normal_6013053311559.pdfIn PDF document text
    • https://lakafoxure.weebly.com/uploads/1/3/4/2/134266374/1134263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492286/normal_5fdc24e6b5c26.pdfIn PDF document text
    • https://zotejukewas.weebly.com/uploads/1/3/5/3/135347558/samagubakobulevum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_43af06c78c654f7e8e6eeb6ebe8c075a.pdf?index=trueIn PDF document text
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_e1f1567d46574480aea3de574f2a918e.pdf?index=trueIn PDF document text
    • http://kivozusemu.atwebpages.com/zodid.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_off00011537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11537 5220 bytes
SHA-256: aff02473752507fa272b268d252c7139836198ea470a119e1ea870e69d739c63
font_01_sfnt_off0001270c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270C 10840 bytes
SHA-256: 71acc9719e437b11e2826247c4a0422d257aa4baf73b8549d52aa1ecf7edd86f