Malicious PDF — malware analysis report

Static analysis result for SHA-256 752b9ebdd52cfedf…

MALICIOUS

PDF

79.4 KB Created: 2021-04-14 19:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f7e7ed42204fe46c27e8e3221bd524da SHA-1: 19b6967d565a8298964566ecd06e3878a25f4d61 SHA-256: 752b9ebdd52cfedf9218d3ae73add0757f7425d7b0b9ea3f2b58fb49248b4268
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://ponafet.ru/strik?utm_term=call+of+cthulhu+rpg+settings PDF link annotation
    • https://kuserivexujeza.weebly.com/uploads/1/3/4/3/134331384/f111058.pdfIn PDF document text
    • http://raftgjgr.space/sad_love_assamese_whatsapp_status_videojhmr6.pdfIn PDF document text
    • http://italywow.info/rafejigitagidawefisumum76221.pdfIn PDF document text
    • http://tamakar.tech/hauppauge_wintv_8.5_activation_code9i15s.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/5T3czal/kitupalurosigo.pdfIn PDF document text
    • http://zoneeuro.pro/que_es_valor_actual_neto_en_matematica_financierakgzlo.pdfIn PDF document text
    • https://mefosenide.weebly.com/uploads/1/3/4/7/134715399/7367e9e57845c.pdfIn PDF document text
    • https://cdn.sqhk.co/lofopapenow/Vk7Aijd/gabukix.pdfIn PDF document text
    • http://uabiomanix.xyz/guxodoxujoxeseazst4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d6921c5e-ad40-47a8-8d28-605c6bd4eeef.filesusr.com/ugd/3306a4_7b51eea0f3194c4ea68567f7b3a20554.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/97165f7c-a9ee-4094-a459-f99b835f1af5/how_much_are_football_coaching_badges.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4e66481-5f2f-4e3b-9713-be4b9526ecdd/garagiwome.pdfIn PDF document text
    • https://badbb018-ab4e-499b-b788-960949b82e3d.filesusr.com/ugd/4f4c56_d362f7c89ad54d069f4a84e7b004474f.pdf?index=trueIn PDF document text
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_85ee0eaaca3b4deba217349878b567ad.pdf?index=trueIn PDF document text
    • https://63a0a607-6d1b-4b95-a813-f1b07cabc719.filesusr.com/ugd/ad56f2_809d17726f7146a6bbc2e9cb7f752783.pdf?index=trueIn PDF document text
    • https://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_f2742d9abcbd41989e152f2687cbebb8.pdf?index=trueIn 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_off0000f9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F7 5184 bytes
SHA-256: 496864cb9cdae067a345c7660d1faa40e7476696fddafd1c3b3e4e17515ff58a
font_01_sfnt_off00010b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B95 11056 bytes
SHA-256: 45b8e46961644b2207c31af35f8756a1bc994c9532e7d77b3c961b86f81b7f52

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