Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f66c038b11fb4f…

MALICIOUS

PDF

74.8 KB Created: 2021-02-21 11:50:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 4bbdd9dc9b1613267cba5d2509757c3f SHA-1: e4a6181e037cdbd56873d53bc6e6eb5621eb510e SHA-256: 23f66c038b11fb4f317eda6348698c6e07d2a04f58cd6f2427ebda95e2eb1103
126 Risk Score

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 embedded URLs pointing to suspicious domains, including one that appears to be a link farm designed for SEO manipulation. The document body, though heavily obfuscated, contains text related to a YouTube search query, suggesting a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://maypoin.ru/strik?utm_term=how+to+crochet+a+granny+square+-+youtube PDF link annotation
    • http://mishgen.com/76423748081ukvxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389353/normal_601d37660e297.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471096/normal_5ff08bb41229b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420610/normal_601f1c2cd8109.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367951/normal_5ff663d4847c2.pdfIn PDF document text
    • http://cleaner360.shop/neopets_island_builders_omelette1hw5s.pdfIn PDF document text
    • http://prizinsta24.space/company_profile_design_templategq7gt.pdfIn PDF document text
    • http://daddytestit.xyz/jebedex2wqzp.pdfIn PDF document text
    • http://goshop32.site/lezavujamirunugolupogajunwfy7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368751/normal_6022c2f6da461.pdfIn PDF document text
    • http://dusosax.66ghz.com/83326253971.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377098/normal_60239087170d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379369/normal_5fd687759316b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460060/normal_6011b8f63069a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450421/normal_602d0e7859fe6.pdfIn PDF document text
    • http://winokuzovew.iblogger.org/kekaha_beach_surf_report.pdfIn PDF document text
    • http://mainsale.info/alabama_boating_license_test_answersvwrsf.pdfIn PDF document text
    • http://cuzinfo.ru/zonirevawerexraap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428069/normal_6023bc58b13b0.pdfIn PDF document text
    • http://wowitaly.space/baby_boss_movie_in_dual_audio2okpv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/chikku_bukku_songs_masstamilan.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/lady_yelling_at_cat_meme_template.pdfIn PDF document text
    • http://vufeligix.rf.gd/54735575598.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/casque_beats_bluetooth_compatible_android.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_off0000e5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B5 5480 bytes
SHA-256: 516e1cd564d68ca60009da64b75d7007bcec9f6d227c08d20b39ea7ed9a15dfb
font_01_sfnt_off0000f86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86E 10868 bytes
SHA-256: 7ad8b50cd923245a698c96af3ec6f1f1bf8c702894f3c44061b21baeb3a1bb22

Open this report in the interactive analyzer, or submit your own file for analysis.