Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b1fc68ba3882781…

MALICIOUS

PDF

89.4 KB Created: 2021-03-19 11:01:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ba25059f740bc4632dd9d1a32cd46aef SHA-1: 192c48d0eeaf7c9891e494c7912d1b0ac15d90af SHA-256: 5b1fc68ba3882781683513eb1ae9772b35ea5848fa7dc6c1a8f4c5acc2ca2cd7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/wix?keyword=soleus+air+dehumidifier+manual+hmt-d70e-a PDF link annotation
    • https://cdn.sqhk.co/kutajanode/OKYie1G/7980032705.pdfIn PDF document text
    • http://misudijawalezom.22web.org/14748543786.pdfIn PDF document text
    • http://fuxutigox.mypressonline.com/best_free_annotation_app_for_ipad.pdfIn PDF document text
    • http://pexanizipudu.iblogger.org/dubai_marina_map.pdfIn PDF document text
    • https://cdn.sqhk.co/dutaxato/0jfgiha/jajotetowivatevevesilibop.pdfIn PDF document text
    • http://nazomomomujo.iblogger.org/gofuvelamavav.pdfIn PDF document text
    • http://gegezuwe.iblogger.org/alimentation_saine_et_quilibre.pdfIn PDF document text
    • https://cdn.sqhk.co/xumesapaxoku/ijgegdH/viruses_are_not_living_because_they.pdfIn PDF document text
    • http://fizebiredasibi.mypressonline.com/reposuweponelugo.pdfIn PDF document text
    • http://sejujanovemo.medianewsonline.com/59895867508.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bipegokatif.onlinewebshop.net/9th_grade_chemistry_test.pdfIn PDF document text
    • http://towupew.epizy.com/jko_counterinsurgency_coin_course_answers.pdfIn PDF document text
    • http://fabodatutowew.epizy.com/curious_questions_answers_about_our_oceans.pdfIn PDF document text
    • http://figofubinodafe.rf.gd/33786046242.pdfIn PDF document text
    • http://boxogegifenefi.epizy.com/what_do_financial_accounting_reports_concentrate_on.pdfIn PDF document text
    • http://movufitajameme.rf.gd/how_to_know_when_airsoft_battery_is_charged.pdfIn PDF document text
    • http://mafoxatuw.epizy.com/introduction_to_digital_logic_and_boolean_algebra.pdfIn PDF document text
    • http://kuxoxulid.epizy.com/tekarixepa.pdfIn PDF document text
    • http://zudosikewemer.epizy.com/herbalist_challenge_rdr2_guide.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_off00011ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECC 5504 bytes
SHA-256: 2178a079c8e21fbeb3130c47ecb78b34e16f649d553678c465486a74fd34a96e
font_01_sfnt_off00013163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13163 12032 bytes
SHA-256: fe43e2cce0753abe2330f27b4ce6cbbad441092a53d817093b942786b0242151