Malicious PDF — malware analysis report

Static analysis result for SHA-256 547ebd41d50b8b1b…

MALICIOUS

PDF

73.9 KB Created: 2021-03-01 23:14:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 40ea3591ff43629873d7af744a88d116 SHA-1: 0412c55d05393a75c24ed6d6071a22d39b4e8a4a SHA-256: 547ebd41d50b8b1b5b901d5094353570658b318c3539b6f974ad2f811ad43cbc
196 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing lure, specifically employing a fake CAPTCHA to deceive users into interacting with malicious links. The presence of numerous external links, including one pointing to a potential phishing domain, and a high ML classifier score strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links indicate a likely attempt to redirect users to a malicious site for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://golowaki.ru/strik?utm_term=facebook+forgotten+password+no+email PDF link annotation
    • https://vaxejoxumede.weebly.com/uploads/1/3/5/3/135346770/nazoz-mebenojub-jezezipesu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369498/normal_602b529cc1736.pdfIn PDF document text
    • https://sefusozikoju.weebly.com/uploads/1/3/4/3/134366316/rizup_kabesuzoponipe_wanadixaxixib_velijisuvesu.pdfIn PDF document text
    • https://zumugewij.weebly.com/uploads/1/3/1/4/131483128/petagatinexini_papekowozow_kuredor.pdfIn PDF document text
    • https://pipefedib.weebly.com/uploads/1/3/1/3/131383483/zedilawax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453326/normal_5fd125ddddf72.pdfIn PDF document text
    • https://sirukume.weebly.com/uploads/1/3/0/8/130814715/velozabibefafik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374860/normal_5ff65bc5e00f0.pdfIn PDF document text
    • https://gidiwukos.weebly.com/uploads/1/3/1/3/131381706/zonetato.pdfIn PDF document text
    • https://zizetorusiwewiw.weebly.com/uploads/1/3/5/9/135990502/juleroru-kapituki-vizilibenaja.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486778/normal_5feb7b85bf280.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://s3.amazonaws.com/mubemutolewe/gonijuwikusuzagiwozawizul.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/3890460117.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/21693511400.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/75023877414.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_off0000d632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD632 5512 bytes
SHA-256: 331425676acbf421be41f95865f01bf4b7aa5c44475d2d4e38c9fcca5f167f05
font_01_sfnt_off0000e8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DE 10416 bytes
SHA-256: a5f9da5538e622e551386e347198bc3be317887e540a9212c534795b82676612
font_02_sfnt_off00010c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8B 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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