Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3fd1a76a2067bc0…

MALICIOUS

PDF

78.5 KB Created: 2021-03-21 05:20:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33c0c75afa6474d046bb2e175dfbbc25 SHA-1: 7985e27d248ce68c41d10ff051e2f72c1d3d1e7a SHA-256: b3fd1a76a2067bc07d6fee4452d75c3e98539745f3e6d6ae555d08e0ccf2c22d
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document body, though heavily obfuscated, contains a URL that mimics a search query, suggesting a social engineering lure. The presence of numerous embedded URLs, many pointing to disposable domains, further supports the phishing and link-farm characteristics.

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
  • 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://vilenefex.ru/strik?utm_term=how+often+should+i+clean+a+cool+mist+humidifier
    • https://cdn-cms.f-static.net/uploads/4454162/normal_602e81668800a.pdf
    • https://cdn-cms.f-static.net/uploads/4472208/normal_6041b73217967.pdf
    • http://jigofajun.22web.org/professional_boxing_training_program.pdf
    • https://cdn.sqhk.co/linidivez/Qjj6idy/fuseritegigaguwezaxozi.pdf
    • https://cdn.sqhk.co/libudezetuv/Mhb3iTL/tejorotidikaxejusigawojeb.pdf
    • http://nokexukuzifuv.22web.org/44854542676.pdf
    • https://cdn-cms.f-static.net/uploads/4457000/normal_6046b86125169.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rowodebifofida.rf.gd/nibabinopup.pdf
    • https://83f018a0-8e49-44f0-b57e-805e464a5f06.filesusr.com/ugd/10a4aa_0a321302c50745eb9f2ea32e43211689.pdf?index=true
    • http://gakupoxefale.epizy.com/vanesemusazidobeso.pdf
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_444db41cf5a54184abbf2c87d9edc2c7.pdf?index=true
    • https://044ec7df-721b-4788-b209-87474a3fcb06.filesusr.com/ugd/60ffa2_c8cc432ab6e24d3d99a6cf9df30667e9.pdf?index=true
    • http://pixibirorak.epizy.com/centrifuge_machine_function.pdf
    • http://kokogaradomope.epizy.com/linawozapaniledibisak.pdf
    • https://uploads.strikinglycdn.com/files/c658ea7d-5aa7-4023-8747-977ae875a140/roridiviwizat.pdf
    • https://uploads.strikinglycdn.com/files/03e7bdd5-bc5a-49ef-b24b-fd51c9888676/korotokexakal.pdf
    • http://wajetidal.epizy.com/11th_biology_book_free_download.pdf
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_1e4a413eee5040dfa3003a7b361f0b71.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_off0000f55e.bin
76c7fe580b67a75859d3b42f66b1a031f73951b5ef9b15aab9e8b74fb840255e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF55E 5316 bytes
font_01_sfnt_off00010756.bin
ca2eff73f38ef8ac88154ba4deb26aad60f2f89c727c896c5131308bb79103f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10756 10964 bytes

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