Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d1675a9fdb70a0…

MALICIOUS

PDF

80.6 KB Created: 2021-04-03 10:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c23a9df0f9b58b40e961efcc947508e1 SHA-1: 1095af3a597f997e49d4d7def6dc3de2664be3cc SHA-256: 52d1675a9fdb70a07697b419eb87703484a6f8438c30026037aa8f9483575c37
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 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/123?utm_term=acog+guidelines+for+aneuploidy+screening PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372707/normal_600bd83c1945d.pdfIn PDF document text
    • http://counterman.ru/koporaxinos35eem.pdfIn PDF document text
    • http://scm03.ru/edtpa_task_2_elementary_literacylwfmc.pdfIn PDF document text
    • http://uber-global.com/89476692115mnmse.pdfIn PDF document text
    • http://tovelksa.website/nasa_news_about_sun_lockdownu8465.pdfIn PDF document text
    • http://podarokinsta365.site/vba_function_in_excel_formulajex43.pdfIn PDF document text
    • http://xbet1.fun/doguvitupezat1f0zm.pdfIn PDF document text
    • https://cdn.sqhk.co/dofofigeniso/eFBRdkl/what_horror_movie_to_watch_quiz.pdfIn PDF document text
    • https://cdn.sqhk.co/luwagoma/jdjhoji/sim_theme_park_pc_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495858/normal_5fdbeb59f39b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403937/normal_5fd12c9a916c5.pdfIn PDF document text
    • https://cdn.sqhk.co/padezeda/jeDhb5C/sizet.pdfIn PDF document text
    • https://cdn.sqhk.co/nejajevafode/pnijgcR/7030547927.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374954/normal_600bc947538e4.pdfIn PDF document text
    • http://soldatskaya6.ru/is_matlab_a_hard_programming_languageavle1.pdfIn PDF document text
    • http://hopecommunitynaz.com/kegugubosebuzuligabak95w.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/siwixomudit/2005_nissan_pathfinder_shift_lock_solenoid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b7627fc-4a71-4ae3-90f6-d680ea4bc0d8/53527940999.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/fubiwowupobovumuku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abf851ad-6f06-415c-97d7-b36e0529c78f/baludiwozana.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/58651507741.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c571ed1-be2b-4e13-af51-865b9e55f94d/completed_performance_review_examples.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

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1F 5416 bytes
SHA-256: c323374635bc1ff78af15ffa7f9d54e931f5bbbbd6fe1d48f7200f3bea02ab1c
font_01_sfnt_off00010ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA8 11224 bytes
SHA-256: e9ae6cbc5f5a4f78cff289d7577b8198283e2f4892225d3ead10c179e028c6ce

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