Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5049264516083bb…

MALICIOUS

PDF

75.8 KB Created: 2021-04-05 23:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ab9873bcbae037bdd29712f06b439329 SHA-1: d97ad2a4f36564383285ca3bdf7b24f295727203 SHA-256: d5049264516083bb0284d27690fa7b5a7dc2d538814c98bb566e4dc9751ecc8e
184 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 by multiple heuristics, including a critical alert for redirecting to known malicious infrastructure and a machine learning model indicating high maliciousness. The presence of numerous embedded URLs, many pointing to disposable domains, suggests a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attack, likely delivered as a spearphishing attachment.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=arabic+calligraphy+fonts+pdf In PDF document text
    • http://sevezor.scienceontheweb.net/the_peasants_life_during_the_middle_ages_was_largely_determined_by.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406168/normal_60674289912f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384468/normal_60411ffb144fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380681/normal_60461e541a1d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501965/normal_606a29b2a81c0.pdfIn PDF document text
    • http://vizazovabula.mywebcommunity.org/22638203490.pdfIn PDF document text
    • https://ravixibede.weebly.com/uploads/1/3/4/5/134584659/vevifelud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443802/normal_6018074060fd2.pdfIn PDF document text
    • http://biomaniix.website/kronos_4500_time_clock_firmwarej77as.pdfIn PDF document text
    • https://bojepelesu.weebly.com/uploads/1/3/5/3/135350442/mivazupu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451949/normal_6056b5334f31c.pdfIn PDF document text
    • http://derapom.iblogger.org/christmas_songs_sheet_music_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380411/normal_60654c3ceea05.pdfIn PDF document text
    • https://memezuwiz.weebly.com/uploads/1/3/4/7/134702577/ladilolixosuduf.pdfIn PDF document text
    • http://koteyarn.moscow/lexis_audio_editor_apk_mirrorkkda8.pdfIn PDF document text
    • http://fibiver.mygamesonline.org/butterfly_garden_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gafodix.myartsonline.com/balancing_chemical_equations_worksheet_110_questions.pdfIn PDF document text
    • http://kelawezup.rf.gd/rogekobesugabekidomumit.pdfIn PDF document text
    • http://xeravujowa.epizy.com/23455678648.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_off0000e9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A3 5648 bytes
SHA-256: 48417ba941142295f8cb53d892da24b454bed705ff7fd98cf0342e9b73dfc220
font_01_sfnt_off0000fcd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD9 10472 bytes
SHA-256: f460055e779cb18f6425a5a595c9919ae0259f70e72038ccc786f42afdcd5253

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