Malicious PDF — malware analysis report

Static analysis result for SHA-256 a51dcfef0421ed00…

MALICIOUS

PDF

82.3 KB Created: 2021-03-18 09:04:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5b533e8184e27560e17ccb34e74ffb21 SHA-1: b501fefcbf52d63e3a822464fbe080359f4dba0f SHA-256: a51dcfef0421ed0097572b2b073f9d57e28af6ee70c58926cb268ab22f46aee5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies the document's structure as a link farm on disposable hosting, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/123?utm_term=cmos+ring+oscillator+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4389361/normal_5fdca68cd2c6e.pdfIn PDF document text
    • https://nefarixuk.weebly.com/uploads/1/3/1/4/131407944/sifodatexajis_nudatepid_veruki.pdfIn PDF document text
    • https://tuvugeti.weebly.com/uploads/1/3/4/1/134108896/9f3338759e85.pdfIn PDF document text
    • http://susurrus.space/73660160133btbhi.pdfIn PDF document text
    • http://reetodo.online/godazedalesogafufejutimapacjo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366017/normal_601000a9ed064.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408863/normal_60223e1eede2c.pdfIn PDF document text
    • http://auth02mobility.com/806438017126w2jp.pdfIn PDF document text
    • http://bunnygummy.ru/jotapimijuredinekivas9tcl1.pdfIn PDF document text
    • http://pewadulojuba.mypressonline.com/zifukatekibazuzebiresewil.pdfIn PDF document text
    • http://fruit-citrus.space/punjabi_movie_ardaas_karaan_in_hdk05ps.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465255/normal_602eb2fee05ee.pdfIn PDF document text
    • https://xurugafidas.weebly.com/uploads/1/3/6/0/136081795/jedoneketukopusubevo.pdfIn PDF document text
    • https://dizabulis.weebly.com/uploads/1/3/4/5/134524464/wawiri_vevinopuw.pdfIn PDF document text
    • http://unreguezff.rest/937164128172i58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425924/normal_5fccdf24eaf92.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kopurelotalad.onlinewebshop.net/61958565234.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/para_que_sirve_la_infusion_de_jengibre_canela_limon_y_miel.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/1052701799.pdfIn PDF document text
    • http://kapirexazi.onlinewebshop.net/tigumamezutomariruwe.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_off00010390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10390 5380 bytes
SHA-256: dec0f64a6fc09d9dff2db1d4492d66687b883fee4179fa9ad6e5c07d2864be9e
font_01_sfnt_off000115c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C7 11288 bytes
SHA-256: 82c952d2c827346cc3da42d9d8ec55914f88621d701cdc785a66d0aef5df01d9

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