Malicious PDF — malware analysis report

Static analysis result for SHA-256 548c99bcc45a589f…

MALICIOUS

PDF

67.7 KB Created: 2021-03-21 11:30:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0253dade8f91caa406f040b18cc35ddb SHA-1: 36237c0238106653f1990c2be2cb8fdccc0e57e7 SHA-256: 548c99bcc45a589f9c758dd2e46e21f224a04d6e23e5eae27c0a7e1400558613
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

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://fokemale.ru/123?utm_term=cricket+background+vector+free PDF link annotation
    • http://daxosivonoz.iblogger.org/83566422234.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389366/normal_6038203e28327.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448330/normal_5ffa8c7361f47.pdfIn PDF document text
    • http://life-news.tech/42938302198hm8fo.pdfIn PDF document text
    • http://qwonder.space/38742517794z9msl.pdfIn PDF document text
    • http://static-get.top/balfour_beatty_annual_report_2017aqcdw.pdfIn PDF document text
    • http://tehnoprom.org/44960890946kvr87.pdfIn PDF document text
    • http://bonmarket.site/47409687711fsi2e.pdfIn PDF document text
    • http://jupizuginilumop.22web.org/paises_hispanohablantes_worksheet_answers.pdfIn PDF document text
    • http://trokot-shopnew.online/maze_runner_book_or_movievgcvg.pdfIn PDF document text
    • http://navalny.design/cycleops_fluid_2_cycling_training_kit54bkp.pdfIn PDF document text
    • http://lubogexu.22web.org/42089155132.pdfIn PDF document text
    • http://damvglaz1.xyz/tewokemugudiguvehdbq0.pdfIn PDF document text
    • http://byseles.xyz/voratazokufi9ajng.pdfIn PDF document text
    • http://sait-ok.ru/pufevuludotutilejozubogcu.pdfIn PDF document text
    • http://workbykoder.xyz/20965053276oboct.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461249/normal_600600235b6c7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nokejufesuw.atwebpages.com/lakshmi_sahasranama_stotram_lyrics_in_telugu.pdfIn PDF document text
    • http://nixutemexeteted.rf.gd/kezeranuxegilusirujul.pdfIn PDF document text
    • http://bukezodebas.onlinewebshop.net/case_files_microbiology_download.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_off0000c1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D3 5148 bytes
SHA-256: 4e08a20deff9844824235e3f3572ab4232467060196f954bb648a99813c0b4e8
font_01_sfnt_off0000d366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD366 9356 bytes
SHA-256: 235611d136d1decd38bb100b46d2e353540ba5e1805ab7a56a3da835a3b12723
font_02_sfnt_off0000f350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF350 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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