Malicious PDF — malware analysis report

Static analysis result for SHA-256 626c511f6808aa54…

MALICIOUS

PDF

82.3 KB Created: 2021-03-17 03:24:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 6ee1227beb83599c3c45864f5fc750ee SHA-1: 3c1a123d56696e349639e927957ad32692cfed20 SHA-256: 626c511f6808aa547dddc0e89333d6e349a022c590215f02d68c1d4cb5321d5c
184 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to disposable hosting domains and are flagged as malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain keywords related to software downloads, suggesting a lure for users seeking specific applications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dafemum.ru/wix?keyword=elsword+shadow+of+luna+apk+%252B+data In PDF document text
    • http://zedateve.mypressonline.com/597031772.pdfIn PDF document text
    • http://xilakivorawavos.22web.org/28179809995.pdfIn PDF document text
    • http://zajilakofudo.scienceontheweb.net/sesixexopuxevavajunosax.pdfIn PDF document text
    • http://jolaxamitagifa.iblogger.org/relimaganokozifevoz.pdfIn PDF document text
    • https://funebaxap.weebly.com/uploads/1/3/4/3/134399245/toboxamabixukixuma.pdfIn PDF document text
    • http://zekojotewakugag.mypressonline.com/53841208968.pdfIn PDF document text
    • https://fesoviso.weebly.com/uploads/1/3/4/7/134710514/nogasosido-xorisir-zufijitigiwunaj-vegemeli.pdfIn PDF document text
    • https://vururera.weebly.com/uploads/1/3/4/4/134493513/wizopuwodef.pdfIn PDF document text
    • https://tovejuzu.weebly.com/uploads/1/3/5/3/135398771/c4a097497013.pdfIn PDF document text
    • https://betetudiju.weebly.com/uploads/1/3/5/3/135348010/3054450.pdfIn PDF document text
    • http://rutekotugu.22web.org/all_my_sons_arthur_miller_film.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xupezewusipoja.rf.gd/how_to_handle_an_autistic_child_in_the_classroom.pdfIn PDF document text
    • http://wiwabapanap.epizy.com/53781093162.pdfIn PDF document text
    • http://rarefovukafulu.rf.gd/mibejorizegadoneneruvu.pdfIn PDF document text
    • http://bakutogigu.rf.gd/riwugexo.pdfIn PDF document text
    • http://jeronegiwok.rf.gd/nafagubakuwopolulevule.pdfIn PDF document text
    • http://lekegavavab.epizy.com/sony_dream_machine_manual_icf-c1ipmk2.pdfIn PDF document text
    • http://mosupixozijet.epizy.com/which_is_the_template_strand_of_dna.pdfIn PDF document text
    • http://lodajozaki.rf.gd/numizusopu.pdfIn PDF document text
    • http://xukomaro.epizy.com/zalenibuvosuda.pdfIn PDF document text
    • http://dizerexipit.rf.gd/annual_return_format.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED01 5244 bytes
SHA-256: e13e36f6f5e87d76c336ad7afc2d8df7dae0f3c580a558a0ae95ab197c919f2c
font_01_sfnt_off0000fee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE4 11240 bytes
SHA-256: 3ae8d3d0cdc42b98dc0ef3db5c60c8a5ab6ec905e931b90c1e254d5eef75a787
font_02_sfnt_off0001259e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259E 16256 bytes
SHA-256: dc0af65ddf5499a7dd57bd8dc818c666ccb1d3abea4e8af31627185443c7826c

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