Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5bf92f575969e0c…

MALICIOUS

PDF

79.2 KB Created: 2021-02-16 22:13:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7ed7284f0ca20e56ab44b78499f6459b SHA-1: bb12b1a87f835b3d91b8d9a2f3f7866e7d765b20 SHA-256: e5bf92f575969e0c9775a3c5998b90e6b8c6ff3baecd778d24c87c57e8839797
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, which is characteristic of SEO link farming or phishing campaigns. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classification yielded a high probability of maliciousness. The embedded URLs suggest the document is intended to redirect users to potentially malicious content or facilitate further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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=june+2016+algebra+1+regents+answers PDF link annotation
    • https://cdn.sqhk.co/gufemazibafi/aWXlRic/chemistry_guided_inquiry_7th_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/iegcje5/42998216385.pdfIn PDF document text
    • http://samo-katim.ru/10233011409mvpeu.pdfIn PDF document text
    • https://xoxisutebigag.weebly.com/uploads/1/3/1/4/131453062/d3b1337335df.pdfIn PDF document text
    • https://cdn.sqhk.co/pekotegafod/AkRZqhj/blaze_of_battle_mod_apk_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/liripudeb/iaie7jh/delicious_emily_s_road_trip_apk_download.pdfIn PDF document text
    • https://wukelefitifaka.weebly.com/uploads/1/3/4/8/134882985/4364052.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410447/normal_6004873c11cd1.pdfIn PDF document text
    • https://cdn.sqhk.co/tumitibira/fcHAxtW/8684821379.pdfIn PDF document text
    • https://cdn.sqhk.co/waxolulum/hig5jaQ/koat_tv_schedule.pdfIn PDF document text
    • https://dimutaribosisup.weebly.com/uploads/1/3/4/4/134444719/070e1828978eb8f.pdfIn PDF document text
    • https://cdn.sqhk.co/nitunoda/jeQtsW4/g_voice_assistant.pdfIn PDF document text
    • https://cdn.sqhk.co/rurufimibiwe/jfbwcia/38318607257.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/jfhd1hc/lymphatic_system_function_and_components.pdfIn PDF document text
    • http://yoganchik.space/terraria_character_creatorbjtr4.pdfIn PDF document text
    • http://chestlune.online/50641623195a82mr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75E 5552 bytes
SHA-256: c2927612b28c6ed5e5a42c7e9433655600b67f64d58f6ca039e063111c9f0b02
font_01_sfnt_off00010a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A69 10900 bytes
SHA-256: 788799236778453ae0849ef6b8e4478fc55d5c0b61be5eb21492cc0c2539ed76

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