Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb648dc453b4cfe…

MALICIOUS

PDF

89.0 KB Created: 2021-02-21 14:13:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 50f05b97ed48ad43876ca3a137629ee0 SHA-1: e571289fd0ab0e47b07b80f04c23c5b87d478979 SHA-256: ecb648dc453b4cfe35abd69a94196171ef16906aca8e73a70e4a676225967277
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 indicating a link to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged the file as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains references to a 'Marlin model 60 buffer spring' and 'wkhtmltopdf', suggesting a potential lure or disguise for the malicious links.

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
  • 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://crophysi.ru/strik?utm_term=marlin+model+60+buffer+spring In PDF document text
    • http://basvuruizleme.online/40126410037q3d5e.pdfIn PDF document text
    • http://kigurumi.org/cultures_of_the_west_a_history_volume_2_since_1350_3rd_editionq1f16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401694/normal_5fe46a51b9ff2.pdfIn PDF document text
    • http://spain50off.info/17196867183yz3tu.pdfIn PDF document text
    • http://misstourist.info/lowiwuson1xowp.pdfIn PDF document text
    • https://cdn.sqhk.co/woxekivepi/EghajdH/kivoxegosi.pdfIn PDF document text
    • http://smotrikino.fun/complex_numbers_downloadf92eu.pdfIn PDF document text
    • http://bodyita.space/what_is_a_key_theme_of_rules_of_the_game_brainly8hyek.pdfIn PDF document text
    • http://topsale.pro/htc_sensation_xl07bqg.pdfIn PDF document text
    • http://apelsins.space/29264787984w691h.pdfIn PDF document text
    • https://cdn.sqhk.co/simixejazir/hjciqHP/flexeril_generic_pill_identification.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402000/normal_603104575f092.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464539/normal_5fd2192ccb667.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408195/normal_601b48edbf17e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/56677205098.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/sifajabubuxo.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/3850427632.pdfIn PDF document text
    • http://bimegisekew.epizy.com/it_wasn_t_me_graphicmuzik_remix.pdfIn PDF document text
    • http://nekexixi.epizy.com/md_dnr_guide_license.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_off00011b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B85 5804 bytes
SHA-256: 48ba78d858a016b510ccce27741c155cb3bdabe692ce46440b64f0c0c6db525a
font_01_sfnt_off00012f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F30 11808 bytes
SHA-256: 3c36db593f13e4b43306ea4c2d242744c5893529263bb13d6e450a55d96458a4

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