Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d87c6399712a64…

MALICIOUS

PDF

86.9 KB Created: 2021-02-25 19:32:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: d8dc8aadda2fc5f74cb1f03d9d63849e SHA-1: d1fb6a4a6c9583160809e555dc514cd462d37607 SHA-256: f4d87c6399712a649d3669493f5718f7089a8fa56042ac6ff69c96078092cb8c
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The ML classifier also flagged the PDF with high confidence. The document body is heavily obfuscated and appears to contain metadata rather than user-facing content, suggesting the primary malicious function is the embedded links.

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.
  • 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.
  • 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://yafferge.ru/strik?utm_term=2003+ford+focus+svt+engine+for+sale In PDF document text
    • https://cdn.sqhk.co/fuxiwimemo/3jhVpOv/hashtags_for_likes_on_instagram_2019.pdfIn PDF document text
    • http://buyervannakupitvsem.xyz/11965765484zj4l5.pdfIn PDF document text
    • http://raguvigawak.mypressonline.com/ti_nspire_cx_ii_cas_user_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/lexebogefaj/fGihGPp/76275081022.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/53443310113.pdfIn PDF document text
    • https://cdn.sqhk.co/madumubo/hbgdD2q/48300837526.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/esqgchh/zofubijofepoluzozavemoge.pdfIn PDF document text
    • http://bridgecommerce.com/the_adventures_of_tintin_the_game_android_apkwj7ko.pdfIn PDF document text
    • https://cdn.sqhk.co/sozovoja/4jffX30/kuvimutorezedonizi.pdfIn PDF document text
    • http://gooddevice-online.com/wasimevegobafudiko4ppm.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/become_a_spiritual_life_coach.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rogofideb.onlinewebshop.net/what_is_hair_theory.pdfIn PDF document text
    • http://bumurulepowele.myartsonline.com/11654399235.pdfIn PDF document text
    • http://wenares.myartsonline.com/lepimuvezowibowozo.pdfIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/nipikivugigagufu.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_off000117d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D4 5592 bytes
SHA-256: ccba60062949f66a4bc71bf767e137ceb2050e8a8e7d27f33bc1633f7fbc4e71
font_01_sfnt_off00012aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEC 10548 bytes
SHA-256: 333c258bda50a2541f460677f60cbf6e5244384743e310c8eb8aa2a1a1179353

Open this report in the interactive analyzer, or submit your own file for analysis.