Malicious PDF — malware analysis report

Static analysis result for SHA-256 51bc241611bdc62f…

MALICIOUS

PDF

79.9 KB Created: 2021-03-20 18:54:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 67c0389bea1a1dada380ce9b28f71382 SHA-1: df89a6d7878cddef810edb26ef2588c038fe9ed8 SHA-256: 51bc241611bdc62fbd96010c96c152712896b8e4cf5c1c0529344b1ce17a08f9
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 numerous embedded URLs, with a primary focus on directing users to 'seumenha.ru' which is presented as a download site for 'flud for pc softonic'. This suggests a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://seumenha.ru/wix?keyword=flud+for+pc+softonic PDF link annotation
    • http://checkmycredit.info/how_can_i_get_certified_for_forklift1xhxj.pdfIn PDF document text
    • http://vquest.website/99724299515aw9ln.pdfIn PDF document text
    • http://jewogipuwivi.medianewsonline.com/xebonixuda.pdfIn PDF document text
    • http://youralteragoods.com/92933394676ar8eh.pdfIn PDF document text
    • http://erethiztzj.space/971909794179c7rj.pdfIn PDF document text
    • http://lnstagramservicecopyrights.com/26783317813azb2t.pdfIn PDF document text
    • http://in-arenas.com/duvafikusavovekogqkeh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_5f7f9c1a7d2641ff9a440ef817aec486.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/petubapizo/ziwovotubixonuwenij.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/types_of_symbiosis_worksheet.pdfIn PDF document text
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_b14e7e168c1a4be5bc96d6ce19c9be7b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b677f13-8100-4d95-a388-c0b389fc3ba9/migugagozitolonoxelog.pdfIn PDF document text
    • http://vidugozu.atwebpages.com/72119262536.pdfIn PDF document text
    • http://doriponesarom.myartsonline.com/7038175217.pdfIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_cf17feca05a74d5c89333798b927dda6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f30ccdb-01be-4197-9d02-e491b0264199/what_was_the_purpose_of_ziggurats_in_ancient_sumer.pdfIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_b9c731ef604c44a3a5cefe72eecdfe51.pdf?index=trueIn PDF document text
    • http://titugol.atwebpages.com/is_witcher_season_2_coming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0be738a-b36f-454c-ab2c-467398f261f8/sole_e95_elliptical_for_sale_near_me.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE663 4892 bytes
SHA-256: 5150c6f970d1c324da36b8d8fec6026254648a252cbda6efb29b3627794d2e8d
font_01_sfnt_off0000f720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF720 11868 bytes
SHA-256: 5e7df6f940a88baaf8ddc016abbe00241955553bfe16e65c2453b9cbaad8103d
font_02_sfnt_off00011d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4D 16144 bytes
SHA-256: 18f56b7fae04e07bc119a468ad323bdda099da77b0772854d1c47cc1f39b9f3b