Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fb427bae35e92a8…

MALICIOUS

PDF

72.0 KB Created: 2021-02-19 01:14:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b039ac0f4a324e046b516eb9928cb5a9 SHA-1: 604fdfa331c50a1d47ea5fcf5355938903598163 SHA-256: 0fb427bae35e92a80cda8f0dec8a9ef63b792dd2d9430f8da82c16a5eb7ca3b1
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including a link farm on disposable hosting, suggesting it's used to redirect users to potentially malicious sites. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

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://baarspo.ru/strik?utm_term=safety+observation+checklist+example PDF link annotation
    • http://1yamal.space/telecharger_dragon_ball_gt_vf69mv5.pdfIn PDF document text
    • http://passive-income.ru/los_temerarios_discografia_320_kbpsv1nhi.pdfIn PDF document text
    • https://cdn.sqhk.co/mitebosareki/cii2JQT/home_schooling_in_covid_times.pdfIn PDF document text
    • https://cdn.sqhk.co/juxefirapuf/EdRjgn3/perpanjang_sim_motor_2019.pdfIn PDF document text
    • http://buyfastedcircle.xyz/wudubiwhberp.pdfIn PDF document text
    • https://wabexerimib.weebly.com/uploads/1/3/0/7/130739061/wamukapiku_monugago_zunijuxirokew_likejuwadu.pdfIn PDF document text
    • http://8bitbeardsco.com/mp4_movies_hindi_download_2019ywg0b.pdfIn PDF document text
    • https://xexidizufom.weebly.com/uploads/1/3/4/5/134508107/9310666.pdfIn PDF document text
    • http://copyrights-notices-helps.com/zaxegimafagomefadosejuwobs5opq.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/ciyidP1/codigo_penal_guatemalteco_y_sus_reformas.pdfIn PDF document text
    • https://gareketekefebon.weebly.com/uploads/1/3/4/6/134695024/f02317a4.pdfIn PDF document text
    • https://cdn.sqhk.co/puwukuwos/fajfgfA/3689386005.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sujobalon.epizy.com/36311948368.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/susuvemujewasutenu.pdfIn PDF document text
    • http://kevowuju.rf.gd/fonuxivogusufef.pdfIn PDF document text
    • http://fujufojijasowek.rf.gd/39853412769.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEB 5792 bytes
SHA-256: 060bfa7b41bcc5cef3f3dace6cff96e855a22a32946a4ecd40a2c09314ecdac9
font_01_sfnt_off0000ef8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8A 10380 bytes
SHA-256: a8d977e4e312e3825a2ab0e8cab18b0f51eeb0f3f5a121d62af853fce05a9e44

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