Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e6ee7a2c41c093…

MALICIOUS

PDF

81.2 KB Created: 2021-04-01 15:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 23ec385ec7c4eae4bb6606919729ab27 SHA-1: 1e94dd9a21d5b1df0cd317e948fd681927957598 SHA-256: a2e6ee7a2c41c09306f1be932cbd84a67afb213d022770fbb06e6b2702ebf790
126 Risk Score

Malware Insights

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

The sample was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a phishing or link farm operation. The PDF structure and embedded links indicate an attempt to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://golowaki.ru/award?keyword=advantages+disadvantages+mother+tongue+based+multilingual+education+pdf PDF link annotation
    • http://repair-planshetov.ru/5572094244b71w4.pdfIn PDF document text
    • http://storeeu.info/angie_s_list_appliance_repair_voorheesf522t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391013/normal_6004063b92a39.pdfIn PDF document text
    • http://amsidgi.xyz/57000964181yunc7.pdfIn PDF document text
    • http://dilijox.22web.org/kukit.pdfIn PDF document text
    • https://jepibuko.weebly.com/uploads/1/3/0/7/130739686/2441615.pdfIn PDF document text
    • http://nadahul.ru/bhagavad_gita_chapter_10_in_teluguhn2ds.pdfIn PDF document text
    • https://gokuxevi.weebly.com/uploads/1/3/4/0/134017514/078283a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374976/normal_5fe45464766b3.pdfIn PDF document text
    • http://monongzhlh.space/how_to_clean_vicks_warm_steam_vaporizern0ocw.pdfIn PDF document text
    • http://5-euro.info/kidokagusouu6.pdfIn PDF document text
    • https://tusopapa.weebly.com/uploads/1/3/2/7/132712380/3090657.pdfIn PDF document text
    • http://gijofabenetawix.66ghz.com/which_book_is_best_for_iit_jam_chemistry.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374198/normal_5ffbece57240d.pdfIn PDF document text
    • http://zoomita.space/84334321001tju62.pdfIn PDF document text
    • https://wevukizolizeki.weebly.com/uploads/1/3/1/6/131606758/efb1926bc38.pdfIn PDF document text
    • http://affilateapp.online/forensic_accounting_and_fraud_examination_solution_manualz0abt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xasibaj.epizy.com/statistics_in_corpus_linguistics_a_practical_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/osaka_railway_map.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/coursera_r_programming_quiz_answers.pdfIn PDF document text
    • http://kogobobud.rf.gd/75098679584.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/21476642624.pdfIn PDF document text
    • http://gawexerexi.rf.gd/similarities_between_probability_and_nonprobability_sampling.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_off0000fcc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC1 5756 bytes
SHA-256: 089e7bd6ed30200f36017298b062e89df53eb1756bd4f454c4d35d49423ad584
font_01_sfnt_off00011035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11035 11276 bytes
SHA-256: d8a8306a280fbf9cea952f999ea174b7eba84551fbe99183f56845e095e0d993

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