Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a948067e52ce81…

MALICIOUS

PDF

78.3 KB Created: 2021-03-24 08:24:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1a3ceb7f8af9e234cdc2fae432c19ba5 SHA-1: 3a3d2e8055ae2be3ea8473681374f51fca9ea344 SHA-256: 19a948067e52ce815e3f6a775bb26912164c1fa9f6fe2475abe3fd1135602519
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-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.
  • 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://baarspo.ru/wix?keyword=the+wizard+heir+pdf PDF link annotation
    • https://mafaredoli.weebly.com/uploads/1/3/2/6/132695491/3002000.pdfIn PDF document text
    • http://fullstacket.online/sit_walk_stand_watchman_neetbgai.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409819/normal_604f3a33ca5c3.pdfIn PDF document text
    • https://kuribigewisowe.weebly.com/uploads/1/3/4/6/134688213/joxopok_vobise_rijakile_melituduferiwar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370077/normal_601baea515b97.pdfIn PDF document text
    • http://fastgetme.online/457169553379hpb8.pdfIn PDF document text
    • http://gujufifirisin.22web.org/accelerating_acceptance_report.pdfIn PDF document text
    • http://custits.space/dell_poweredge_r710_price_in_pakistanz7h2u.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504554/normal_5fee3a6ec7427.pdfIn PDF document text
    • https://runumoviw.weebly.com/uploads/1/3/4/8/134854062/mikutosul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://femejedad.epizy.com/warehouse_associate_interview_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/869a41c6-c347-4498-898b-9bc408010aa8/37752461386.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8272d5ef-a99d-43a6-825b-429e38fccfa8/57097987757.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc4da804-a5da-49e2-a710-d81bccefc59b/23214178394.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/431e7300-8d3c-4b06-8843-afc23cfe7432/72949305775.pdfIn PDF document text
    • http://redejepivu.rf.gd/add_text_to_acrobat_x.pdfIn PDF document text
    • http://kovolotog.epizy.com/jajudopoletedepepudakasi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6108625-d806-4081-bfde-a330a59a3eab/76819241029.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5a3f769-0479-48be-85a7-fde4098231ca/41027071086.pdfIn PDF document text
    • http://dojidusajotat.epizy.com/45288186132.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14d32084-a009-4c4b-bc9d-6ea2852b7b22/desde_cuando_es_obligatoria_la_educacion_media_superior_en_mexico.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_off0000f5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AC 5012 bytes
SHA-256: 4d506dd6e3fb900a7d93021e948f0455292bf117794dec830713723cb067cf32
font_01_sfnt_off000106ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CE 10816 bytes
SHA-256: 2ccd4c3e4b1baf819774522f0f85f3fddbeb15a3136b603762c8bb98f03dc75b