Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c52f75d6c21260…

MALICIOUS

PDF

85.8 KB Created: 2021-02-26 03:26:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 00908f7a1f9897cc48f0f09a1e468f88 SHA-1: 6ceb06627a505d00fede59dd8caf9e6571d889ab SHA-256: 86c52f75d6c21260c65a81c4988ea737f214520abb4ea016644e616422f102fd
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/award?keyword=death+note+ryuk+voice+actor+english PDF link annotation
    • http://rejemezurufoveg.mywebcommunity.org/simple_python_programming_questions_for_interview.pdfIn PDF document text
    • http://nafarami.medianewsonline.com/raneliwuwetusogududan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462362/normal_5fd3dbfe9fe29.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489969/normal_5fca1750998f9.pdfIn PDF document text
    • http://wijasagasipode.getenjoyment.net/the_merchant_of_venice_no_fear_shakespeare.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480161/normal_5fc71bd27fa99.pdfIn PDF document text
    • https://patobozojewe.weebly.com/uploads/1/3/4/8/134863794/setefarapir-delozezon-muret-muzosefur.pdfIn PDF document text
    • http://jekenufakewe.mypressonline.com/nordictrack_act_commercial.pdfIn PDF document text
    • http://dafagaketa.sportsontheweb.net/configurar_router_linksys_wrt120n_como_bridge.pdfIn PDF document text
    • https://fepobiwebefu.weebly.com/uploads/1/3/4/5/134592484/wuwobifomigarev.pdfIn PDF document text
    • http://tufuwavaziga.mygamesonline.org/how_to_watch_little_fires_everywhere_show.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411252/normal_601da3c7e5265.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470835/normal_5fda3c82671ea.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/vofadoloves/bodujekamu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10239 5744 bytes
SHA-256: 727a987da663d9e85c2c30fb01b31d62fe669d6d6b0e539313b902cb5da25ab3
font_01_sfnt_off0001162f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162F 5288 bytes
SHA-256: 6160ba6924450ea89d8406aadedd96e917917c78c619f2572abae73fd78364b4
font_02_sfnt_off0001283c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283C 9660 bytes
SHA-256: c15abc62c837a9625f28504a8136498640960a1e750161ba3f53a5576cb2ad12

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