Malicious PDF — malware analysis report

Static analysis result for SHA-256 538d66c2e1ce075d…

MALICIOUS

PDF

70.5 KB Created: 2021-03-15 22:19:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4411af3da3cb378d4144d2fd47165a09 SHA-1: bf1b32e1f237f0c0baeb4ae7b57453655d76d8c2 SHA-256: 538d66c2e1ce075dcf2a6e14c79fc61d519befbc469b6e25987e58beaa8cc24a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, including one pointing to 'gimoguvi.ru' which is associated with a 'literary elements worksheet 6th grade' lure. The PDF also utilizes link farming techniques on disposable hosting, indicating a strong intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://gimoguvi.ru/123?utm_term=literary+elements+worksheet+6th+grade PDF link annotation
    • http://opt15.ru/2010_camaro_ss_for_sale_florida8u851.pdfIn PDF document text
    • http://nefozufovi.scienceontheweb.net/what_is_a_good_sat_subject_test_score_for_math_2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413244/normal_6040606b2baed.pdfIn PDF document text
    • https://cdn.sqhk.co/rogotojuseb/cggPZig/gomuwajeter.pdfIn PDF document text
    • http://latencfsrt.space/android_tv_box_flow4fdw6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489411/normal_602a82c39b780.pdfIn PDF document text
    • http://litvinenko.xyz/where_can_you_find_engine_numberf076n.pdfIn PDF document text
    • http://dezimazokuxulil.mygamesonline.org/mixugepafagugoluzof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387427/normal_600826e0c7f6b.pdfIn PDF document text
    • http://erse.xyz/5400491265tx4jz.pdfIn PDF document text
    • http://stylecurtains.com/mogajenobubuzinosavebszn.pdfIn PDF document text
    • http://waranijovuv.sportsontheweb.net/nobiwibujakisuworex.pdfIn PDF document text
    • https://cdn.sqhk.co/rogevuzazi/hjdcgj9/wonalesuxurarir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489850/normal_600211e53fb5e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4461694d-a6f7-4a69-895a-ff5ddeb3c622.filesusr.com/ugd/f504fb_49a03105ae76462c981a030186c3ad54.pdf?index=trueIn PDF document text
    • http://muvipej.atwebpages.com/icao_annex_10_vol_4.pdfIn PDF document text
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_427f248d3cc44a829298c2e463ee5b5d.pdf?index=trueIn PDF document text
    • http://wuzuruwevirelu.rf.gd/71841084626.pdfIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_241ea4337cc24ce89be221cb449b5a49.pdf?index=trueIn PDF document text
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_c0e9f1fd47644297bd9b98563b07f74c.pdf?index=trueIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_09f4b8d29a7c427f8babc9256ae5976e.pdf?index=trueIn PDF document text
    • http://tilawiveso.rf.gd/how_to_reset_cobra_alarm_honda_city.pdfIn PDF document text
    • http://zexubuwebujuk.rf.gd/heroes_evolved_mobile_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_off0000d562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD562 5592 bytes
SHA-256: e98d867f718bd8269746094a76ef905a8ba48cf942146a958459201895a54b7d
font_01_sfnt_off0000e85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85E 9940 bytes
SHA-256: db9a39120e2bd79b40619456923ffb84d115647c508d7cb3f27d3aa27198a8fa

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