Malicious PDF — malware analysis report

Static analysis result for SHA-256 f61495d91df17344…

MALICIOUS

PDF

78.3 KB Created: 2021-03-20 11:34:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2166ffabad86ea374ae8569532946f96 SHA-1: b3b2bee67afcc198301e621dadfa0934c4872922 SHA-256: f61495d91df173447f31a0c984fa2ac33eac5a8eb5edd5202571dbad18052f06
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-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://dafemum.ru/award?keyword=cost+and+management+accounting+basics+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4502817/normal_5fca4afba575e.pdfIn PDF document text
    • https://dagaroxir.weebly.com/uploads/1/3/5/9/135973008/loduzoluwikelaxule.pdfIn PDF document text
    • https://cdn.sqhk.co/jofijoju/gchcrja/43978032622.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448713/normal_6028bab98f82f.pdfIn PDF document text
    • https://reguzuseja.weebly.com/uploads/1/3/2/6/132695615/8487245.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482413/normal_601e4fc044abf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454182/normal_60118b805f9b2.pdfIn PDF document text
    • https://cdn.sqhk.co/pukefoxer/iihhia9/bikapolupuvalananogow.pdfIn PDF document text
    • https://cdn.sqhk.co/kowukogifaw/mgiYghf/44820824288.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461216/normal_60530f12b7d2c.pdfIn PDF document text
    • https://dolilufaxeni.weebly.com/uploads/1/3/2/6/132683246/jefuta.pdfIn PDF document text
    • https://womawojixamukof.weebly.com/uploads/1/3/0/7/130740010/6017652.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381320/normal_60524adf1f7c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468571/normal_5ff02e1f1ba69.pdfIn PDF document text
    • https://bugotenopiziwa.weebly.com/uploads/1/3/0/9/130969298/eb2bc09d5bdcc15.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/74165a91-f2fe-4658-9541-3f884ce23636/how_to_unclog_a_keurig_mini_coffee_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9270573f-a839-47fd-92f1-342f51547197/how_to_consume_soap_webservice_in_java_without_wsdl.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/new_york_integrated_algebra_textbook_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2483a921-2fff-4b24-8fcc-0182db13c16f/24858755244.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/fikiludikimu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5c632b5-42c4-4402-acf1-5bb3c5fff445/how_to_program_a_minitor_v_pager.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/latest_hangout_dialer_apk.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_off0000f722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF722 5392 bytes
SHA-256: c3d20ed6351846f5a63dc9cb3c1f57d749fe26a52687c3488908dcf43c74c22f
font_01_sfnt_off0001096d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096D 9960 bytes
SHA-256: aaf088f02cc5bca2e66a58461c8cee4e84637064f7e98de232b539531c20ffa4

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