Malicious PDF — malware analysis report

Static analysis result for SHA-256 457b5b0ba2d0ef8a…

MALICIOUS

PDF

74.2 KB Created: 2021-03-12 19:16:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2ede017596c329e9f0512ea48d36988c SHA-1: b0caeb6f1c874e1b2b47d7129190e4806322fc4a SHA-256: 457b5b0ba2d0ef8a8aad9ec546a033b62b14b7aaf058891f986551f5d154c1ce
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 as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/strik?utm_term=scid-5-cv+starter+kit PDF link annotation
    • http://batmbatm.ru/why_does_my_realtek_audio_manager_keep_popping_upnycer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464083/normal_5ff4e1652a3fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502906/normal_602486d05a051.pdfIn PDF document text
    • http://ighelpcenter.xyz/15221451853bvhx5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420468/normal_5fcf23495aa46.pdfIn PDF document text
    • http://fomijegi.mypressonline.com/czasy_gramatyczne_angielski_tabela.pdfIn PDF document text
    • https://cdn.sqhk.co/majumoros/cWQqjex/jatidisafotesedudoxodo.pdfIn PDF document text
    • http://maewallace.com/jusunikexizobapulan4gpve.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428335/normal_5fffaedb01769.pdfIn PDF document text
    • https://balesiloruj.weebly.com/uploads/1/3/4/6/134671801/larexoxib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455376/normal_6004987c79c46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427523/normal_60110e8694115.pdfIn PDF document text
    • https://cdn.sqhk.co/wafifovuwel/c6mQw5F/29071552739.pdfIn PDF document text
    • https://tokafiwunan.weebly.com/uploads/1/3/4/3/134372509/08bd9b5f917978e.pdfIn PDF document text
    • https://tajaleder.weebly.com/uploads/1/3/5/3/135320318/mixanakodil_degepopaxal.pdfIn PDF document text
    • http://dududuw.mypressonline.com/speed_queen_gas_clothes_dryer_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/komagiju/Qgkhcia/rusty_bucket_back_bling.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387430/normal_600d9dc5bf226.pdfIn PDF document text
    • https://rebejudan.weebly.com/uploads/1/3/5/3/135316845/22d6224ad2.pdfIn PDF document text
    • https://cdn.sqhk.co/wimedizi/gceijhj/lijijunelapezojolokugimom.pdfIn PDF document text
    • http://prodson.fun/how_to_write_legal_letter_to_clientsqvsd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366041/normal_6023dcc2814fe.pdfIn PDF document text
    • https://mivunibetokujix.weebly.com/uploads/1/3/1/8/131856995/45f9323101.pdfIn PDF document text
    • http://org-fruit.space/rofulosaepzz6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AB 5284 bytes
SHA-256: 6260dfcd9d07d343f2ced1efe3b18c4728e6d5ab4e7dc18ad242b998db6f8e52
font_01_sfnt_off0000f6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C1 10700 bytes
SHA-256: f50a7a1c1e9405bd0612c4c8dfc5918a3c234bd828007dd1b7636d06c44f5a5a

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