Malicious PDF — malware analysis report

Static analysis result for SHA-256 251875cedb018325…

MALICIOUS

PDF

70.9 KB Created: 2021-02-27 16:15:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1407ef3d69baab01166302aa300f5e28 SHA-1: a90503ef44d9b4bb098c1110849e6556bb8e58cf SHA-256: 251875cedb018325112e88ddadf3e41bb987b0f6d8ade209993dda1335465d36
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://fokemale.ru/123?utm_term=soleus+window+air+conditioner+not+blowing+cold PDF link annotation
    • http://xabisafeb.22web.org/87728144642.pdfIn PDF document text
    • http://1eyvgo.xyz/makebesofebizitixatukomjn2s2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451955/normal_5fc8488da7eaa.pdfIn PDF document text
    • http://streamsweets.com/jewosivegamoxedizebl0xl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473410/normal_5fd37dfc329ac.pdfIn PDF document text
    • http://gamedv.design/xaruluberupozufct0cl.pdfIn PDF document text
    • https://sojinunanujiwok.weebly.com/uploads/1/3/5/3/135311630/wotujosogit.pdfIn PDF document text
    • http://sikalaporaka.22web.org/kealakekua_bay_guided_snorkel_kayak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476421/normal_5fdd69761ac67.pdfIn PDF document text
    • http://mukifufiri.iblogger.org/67032598017.pdfIn PDF document text
    • https://poxuweke.weebly.com/uploads/1/3/1/6/131606533/padirojiveje.pdfIn PDF document text
    • https://xuwuperozaposa.weebly.com/uploads/1/3/2/3/132303395/44574.pdfIn PDF document text
    • https://dofipoxadule.weebly.com/uploads/1/3/4/3/134314370/7806268.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://potosalusuk.rf.gd/data_science_intern_salary_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/30260349656.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/1657894495.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_off0000d840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD840 5440 bytes
SHA-256: 6cedc244f8b73fda66b0438d04d3d68ab2e1d59a4f4c66d6afbcad391d61abb7
font_01_sfnt_off0000eade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADE 10400 bytes
SHA-256: d754c408fe61aabcbac5d8779d0e21eb4fa4ca3630d664d7d34c3e348aa0ff8f

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