Malicious PDF — malware analysis report

Static analysis result for SHA-256 e34ddc408d76b6ce…

MALICIOUS

PDF

72.4 KB Created: 2021-06-06 02:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fca088fd06ec56274c0af0c6fff8a78d SHA-1: 21af82e369fba137213a1a36f07b118605435fab SHA-256: e34ddc408d76b6ce990cb62ad3149c74f37c73eda226ba22ae73af3d5a63db89
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that redirects to a link farm, suggesting a phishing or malicious redirection attempt. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, which could be part of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://infrive.ru/pbw?utm_term=pocket+dilation+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4457005/normal_5ffb0950012f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410027/normal_601851c325f35.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/38483072-88ef-44a0-a0b6-c5c1796a91cc/33557190115.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a36e205-a937-48df-a854-4dbecdb59d21/starting_strength_over_40.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e9874ed-7518-4fac-9583-cd7a246eb36e/95030914593.pdfIn PDF document text
    • http://kapetipubi.pbworks.com/w/file/fetch/144426477/10424096106.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d963fe25-f08a-405f-86a4-ff0be0f8ab86/16146033020.pdfIn PDF document text
    • http://zuwofig.pbworks.com/w/file/fetch/144615705/67763868725.pdfIn PDF document text
    • http://fadoposapat.pbworks.com/w/file/fetch/144576579/planeacion_didactica_del_14_de_febrero_para_preescolar.pdfIn PDF document text
    • http://masawumel.pbworks.com/w/file/fetch/144427362/what_does_inactive_account_mean_on_credit_report.pdfIn PDF document text
    • http://joxakuruvi.pbworks.com/f/miracles_from_the_vault_book_free_download.pdfIn PDF document text
    • http://ruxafonan.pbworks.com/f/wikizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f6f0a99-448a-430b-9ae0-4d7f6eeb6469/toregig.pdfIn PDF document text
    • http://xugatun.pbworks.com/f/xuzosudixivuvofilo.pdfIn PDF document text
    • http://sagidetubi.pbworks.com/f/17582672482.pdfIn PDF document text
    • http://xelivolofuso.pbworks.com/f/turowapunisafife.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd9d514f-05b5-4fa8-9671-0facc27a25dc/jvc_kw-r910bt_how_to_change_color.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c51c647-4d8d-4c91-8147-034ab5ca422d/elements_of_arts_in_egyptian_sculpture.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/w/file/fetch/144576387/giregujavuvuxeluwoxogodaz.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_off0000de87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE87 4900 bytes
SHA-256: 8fb9c30ae97ceb0ab4ad3cdae41ee2051c795f24faeb5c13edca4428c6f4562b
font_01_sfnt_off0000ef4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4D 11096 bytes
SHA-256: 939d776b6e758902b00da3b80df2e69ba24061802ca529622e73b6149d91ee1d

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