Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e70aef38052326e…

MALICIOUS

PDF

141.4 KB Created: 2021-06-10 01:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c3c2e9ce958f4f180c5f2af1907f6935 SHA-1: b057dbebeeb9f092cfe66152b88533cfec6fab03 SHA-256: 1e70aef38052326ebb38b8a2a3b75c10689931e4f5f5e7101af052a68b0734e5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://medvor.ru/pbw?utm_term=noun+verb+adjective+adverb+list+a+to+z PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413573/normal_5fe84e5b43fb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366666/normal_6049a192e7a3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383170/normal_6026cd5385844.pdfIn PDF document text
    • https://jatekowi.weebly.com/uploads/1/3/0/7/130776123/4124154.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426972/normal_605c68dca93c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407664/normal_6011c22340db9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404124/normal_6024566702dbf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382613/normal_5ffb0bfb8d170.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4425726/normal_60b2234db3cf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427300/normal_6041dd2e2506f.pdfIn PDF document text
    • https://betutoza.weebly.com/uploads/1/3/4/8/134899773/5936688.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479705/normal_5fffe48c275b0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://damopijos.pbworks.com/w/file/fetch/144595194/how_long_does_it_take_to_fix_a_stalled_car.pdfIn PDF document text
    • http://ridelox.pbworks.com/f/20_point_qr_codes_pokemon_sun.pdfIn PDF document text
    • http://ginosofep.pbworks.com/w/file/fetch/144937209/fourier_transform_for_dummies.pdfIn PDF document text
    • http://ridelox.pbworks.com/f/american_gangster_2007_watch_online_free.pdfIn PDF document text
    • http://fawitugeva.pbworks.com/f/latusumedupowinarofus.pdfIn PDF document text
    • http://torefobomuzu.pbworks.com/w/file/fetch/144773556/cuerpos_geometricos_nombres_caras_bordes_y_vertices.pdfIn PDF document text
    • http://tusoxefum.pbworks.com/f/contabilidad_de_costos_ortega_perez_de_leon_libro.pdfIn PDF document text
    • http://jeveriwilum.pbworks.com/f/photosynthesis_virtual_lab_answer_key.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_off0001ef4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EF4F 5228 bytes
SHA-256: 7ee759692a69534b2e2c18233b400554c46a03b45766c36c736be1791d90b18d
font_01_sfnt_off00020134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20134 11460 bytes
SHA-256: cf58d216d1b78385bfa7657cb1eee9616463c203ae4c331c0772e7bca4bd09dc

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