Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b436639dd5206c…

MALICIOUS

PDF

79.4 KB Created: 2021-04-22 08:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ce6c7832ec2b9ad76417ee0bba0b518 SHA-1: 22e72f5d5c37076319ed1cc2e066e4241cdd4427 SHA-256: d7b436639dd5206c4689c62d79886d430639b3c6b7394b1b0d2b58b21a0a18ed
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or redirecting users to malicious content. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=network+security+engineer+salary+philippines
    • https://cdn.sqhk.co/ropobemuma/epfichd/classic_table_tennis_paddle_set.pdf
    • https://cdn.sqhk.co/zimidenex/hb3gdhj/koxekozadokapojitavimejug.pdf
    • https://cdn.sqhk.co/bidogefapo/zjgsRhe/82959965276.pdf
    • http://rufojoto.22web.org/thermo_king_reefer_parts_list.pdf
    • http://wumimavemiba.iblogger.org/1954115004.pdf
    • https://cdn.sqhk.co/jigitovewuk/fihmibo/sarololenilegekatalevodax.pdf
    • http://zurufarovosu.iblogger.org/wezupikuwubulamazugisugur.pdf
    • https://cdn.sqhk.co/jovuvufoxet/XRzO1jc/83605664675.pdf
    • https://cdn.sqhk.co/jukowejazus/i4ieIia/algebra_functions_worksheet.pdf
    • http://zotaravaka.22web.org/sujozekimiki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://be8f41f0-9ddd-434d-ab6d-aa755a40b80d.filesusr.com/ugd/726d9c_a6f35653697d45d7beaadbdc98c082ba.pdf?index=true
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_7268335471bf4718be1f1263c0c27f42.pdf?index=true
    • http://susijul.rf.gd/17854534044.pdf
    • https://uploads.strikinglycdn.com/files/52d0c513-74a2-408e-a7e0-10e1407ce4a7/millennium_lo_que_no_te_mata_te_hace_ms_fuerte_pelcula.pdf
    • https://6da1ed31-7a22-45b0-8bc5-463d376071ee.filesusr.com/ugd/29fbaf_fa373b616d26421295e1c517a70b61c8.pdf?index=true
    • http://rejefuwozumij.rf.gd/83212216227.pdf
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_01abe9727c064eef9c07c42e66b4e7a3.pdf?index=true
    • http://livagutavox.epizy.com/jatawusuvuxafavizawi.pdf
    • http://xovezoremu.epizy.com/42_letter_sounds.pdf
    • https://uploads.strikinglycdn.com/files/4fc600c5-0fee-44ab-a7ce-d9ebbe932afa/will_deadpool_2_be_on_netflix.pdf
    • http://wutidisixuv.epizy.com/elements_of_programming_interviews_in_java_github.pdf
    • https://uploads.strikinglycdn.com/files/0c928f24-89e4-4201-9d72-042f5bb97f21/samsung_50_inch_qled_4k_uhd_smart_tv_qn65q60tafxzc.pdf
    • https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_4dc6c6ea42574e31be863922068da34d.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8e4.bin
869e6ffe3e56315414bb740452e84e028d9fdc886d700fc65110b1d59f1cff3f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E4 5420 bytes
font_01_sfnt_off00010b76.bin
3efd7babf2859159d3cdd8c8e5393954442c1d30d1705275f662e8fec93d386b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B76 10884 bytes