Malicious PDF — malware analysis report

Static analysis result for SHA-256 23623b48fa07a3db…

MALICIOUS

PDF

82.3 KB Created: 2021-04-06 07:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 753cdc08873ab58e040b818fe1206094 SHA-1: d6ce9f73a28b90ae4e9ebc79a5b7e4ee47732c50 SHA-256: 23623b48fa07a3dbc80da8d9481fc4ce7c0d66895381b8680e2cfd90bc2a429c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to appear as legitimate content, such as game guides or worksheets. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive URL usage suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/strik?utm_term=witcher+3+hearts+of+stone+good+ending+guide
    • https://cdn.sqhk.co/mopewedote/hjhpidJ/dupabomulikamanimewaso.pdf
    • https://ruzuwigowan.weebly.com/uploads/1/3/1/4/131453288/ee9767e1de8.pdf
    • https://cdn.sqhk.co/miwiwefe/aK4ijGm/math_worksheets_on_slope_and_y_intercept.pdf
    • https://cdn-cms.f-static.net/uploads/4420454/normal_5fd632af5126a.pdf
    • https://cdn.sqhk.co/nepelusir/FYeXia5/67598279760.pdf
    • https://static.s123-cdn-static.com/uploads/4367296/normal_6003a5ca5e7e9.pdf
    • https://cdn.sqhk.co/zatovafer/bmuX6hd/texas_gas_service_payment_by_phone.pdf
    • https://cdn.sqhk.co/suwojixuwebi/uhewggs/touch_math_skip_counting.pdf
    • https://cdn.sqhk.co/fonixoligem/Lhhnhbv/draw._io_github_desktop.pdf
    • https://cdn-cms.f-static.net/uploads/4452624/normal_5fd7ce8fdb27f.pdf
    • https://wunopavowar.weebly.com/uploads/1/3/4/6/134660490/9917352.pdf
    • https://sorunamupojiwek.weebly.com/uploads/1/3/1/4/131407183/8476040.pdf
    • https://cdn.sqhk.co/fazologim/Ju3thjf/17165583635.pdf
    • https://cdn.sqhk.co/lemisobe/gjuGyQS/mobile_text_message_tones_for_android.pdf
    • https://cdn-cms.f-static.net/uploads/4379387/normal_60367ddbbde02.pdf
    • https://cdn-cms.f-static.net/uploads/4419642/normal_601fab47f3afc.pdf
    • https://cdn-cms.f-static.net/uploads/4501965/normal_600cab5ddb41f.pdf
    • https://cdn-cms.f-static.net/uploads/4477147/normal_5fd665fd82228.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://xevaxujexodo.epizy.com/where_to_donate_furniture_in_chicago.pdf
    • http://lekukulefu.epizy.com/tarikafumigokuferuva.pdf
    • http://wekameti.rf.gd/vexaliboluzifixizadoro.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7dc.bin
65310bb2bbe96fbaddfda73117d35e4773f2f5183c16ca6fd19205e6fa25e4b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DC 5312 bytes
font_01_sfnt_off000109e5.bin
4941abad5ee5fc1fa75d1965e8b5565e774050cb130741a59cb6eac2d7e757db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109E5 10484 bytes
font_02_sfnt_off00012d95.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D95 4324 bytes

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