Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c43b8452bf8570c…

MALICIOUS

PDF

75.9 KB Created: 2021-03-22 05:36:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2b96fb50b1ad9c99aa658eabc8ff42a3 SHA-1: c3d178752963ab55efa9c67192e8e3185cedfab4 SHA-256: 6c43b8452bf8570c7843b28ee464b24f83b8ca27ef46621be860945af161051b
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to SEO redirectors and link farms, a common tactic for phishing or distributing malware. The 'DOC BODY' content, though heavily obfuscated, suggests a lure related to 'Rosa Parks images in color'. The presence of PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK heuristics, along with ClamAV detection as Pdf.Phishing.Trojan, strongly indicates a malicious intent to redirect users to harmful content. No scripts were extracted from this sample.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://leonvi.ru/wix?keyword=rosa+parks+images+in+color PDF link annotation
    • https://cdn.sqhk.co/jivazufevi/bgj8Jm7/51148050281.pdfIn PDF document text
    • https://cdn.sqhk.co/lexelinowe/jhL1yDv/lupijivuniwakiwukovo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414334/normal_603d06f2024f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413112/normal_600ae618c9c03.pdfIn PDF document text
    • https://cdn.sqhk.co/fipimomozuk/d9hjwhc/can_u_mix_oil_paint_with_water.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/d24e0091-e554-4ed0-ba09-c67a72821ac4/wapapavimigir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc95430f-ca1f-4499-9175-674d332a922a/gesafawiwalozapopugojusa.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/66913408727.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9da8e99e-0530-4e58-9306-c03b2ef1fd3a/74606986934.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b14395e-72ab-47f6-88fa-4fa307568684/84000724551.pdfIn PDF document text
    • https://62abf401-5fc9-4991-ac00-cb6a0c8cf8ec.filesusr.com/ugd/e4ff69_c28968b4ab9044b9aafd4c61e8b471ac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b025a70-8cf8-4221-8c66-0d71c5105475/62043365753.pdfIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_478523d5708842048b4ca68743c7701a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff707d80-2ef3-4438-83b3-ccb5eb9cad50/tabla_de_distribucion_normal_estandar_completa.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/python_video_tutorial_for_beginners_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/trane_xe90_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/basic_electronics_course.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb4e289a-bc3c-4133-b6da-201f96be23a9/4314050879.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/best_cv_templates_2018_word.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_off0000ec4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4F 5324 bytes
SHA-256: fd4c7fd72e43eca493c829a21d5f75c1e0df9f135dd75d3cdafd694ccb886179
font_01_sfnt_off0000fe63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE63 10592 bytes
SHA-256: 47bb3dcb4cec7f3549c801d3e31f1a2f8db8cb4f7d4619fe2d6729e99652dffa