Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33faa21186a937f…

MALICIOUS

PDF

70.6 KB Created: 2020-11-23 05:36:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d8f014d5c813808aafdd22632b4c4845 SHA-1: 148baac3c7463e33a6a5e8794b1e40aa4f76ee9f SHA-256: c33faa21186a937f8d1417639e1515d48f235aeb2fbd9f0ddc73139107e3c616
194 Risk Score

Malware Insights

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

The PDF file contains a link disguised as a game guide, which is a common lure for phishing or malware distribution. Heuristics indicate the link points to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing a second-stage payload.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/aws?utm_term=legion+commander+dota+1+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365542/normal_5fa1bd1c03de5.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/e9aff73f-bdb8-499a-9efd-29d7c7aae875/window_on_humanity_5th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/anomalias_cromosomicas_estructurales.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/68904751320.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/metro_map_los_angeles.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/upkar_ssb_interview_book_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/social_constructivism_theory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0026ea6-82da-4271-8650-d43ce5080d44/xoxajufuxatatumide.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/25409907448.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f26a41f-96f0-4c23-af4e-c151996d82a8/76899782439.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1d6013b-b065-44c4-8be9-8563d33a86a7/30338935575.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/tv_guide_venice_florida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf4c8689-5ec6-4994-adf8-72b21a53790f/leyes_de_los_gases_ideales_charles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ed110db-0d33-41fc-8882-8fdda83c0387/98557129153.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/miwowi.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/viewbug_website_login.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11a1e9dc-0932-4cca-8d82-0aa9788de73b/evaluation_groupe_nominal_ce2.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_off0000d918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD918 5040 bytes
SHA-256: b39280b7a42976db5f088eaae0c9cef2156f2849f317e68fee7372c9a52bbf27
font_01_sfnt_off0000ea2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2C 10312 bytes
SHA-256: 011d5cc283f6586865eb332c62d434eff336973ff2470a6f19a568b39d172186