Malicious PDF — malware analysis report

Static analysis result for SHA-256 941c9eaa23be4d6b…

MALICIOUS

PDF

92.4 KB Created: 2021-06-06 18:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: dd1ed5955253f43095a8c85b2c37efc4 SHA-1: 95b500929376dcaf6ca9b329aa7970db585a76e6 SHA-256: 941c9eaa23be4d6b9675f58d23d7dc9c0c391eee46952402ae30374456402cff
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 0.9998

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://coretry.ru/pbw?utm_term=perdi+mi+constancia+de+primera+comunion PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450502/normal_600134a487014.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456984/normal_6025cd543439a.pdfIn PDF document text
    • https://pepigapipewoma.weebly.com/uploads/1/3/4/0/134000130/sawexuzemigaluso.pdfIn PDF document text
    • https://mazaxijav.weebly.com/uploads/1/3/4/4/134488449/92bc57c2.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/1a657398-11a5-4ec7-b83b-40a1b4c46c6f/is_typing_35_wpm_hard.pdfIn PDF document text
    • http://fatakalewene.pbworks.com/w/file/fetch/144502401/download_film_bulan_terbelah_di_langit_amerika_2_lk21.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5638393c-3b78-44f8-ac02-9879664a03f3/11630425223.pdfIn PDF document text
    • http://xuzutoli.pbworks.com/f/coogee_chemicals_annual_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fc432fb-4c4c-4a98-a9c7-8e06d187060a/how_to_use_grosgrain_ribbon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b75c2356-f4f5-4f72-b2f8-76c88d3a74a6/el_amor_en_los_tiempos_del_colera_personajes_secundarios.pdfIn PDF document text
    • http://palejemevat.pbworks.com/w/file/fetch/144518385/xerewod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8c80b8b-50a3-4008-88a9-d91925599206/27755189062.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16e49123-158e-406a-9ef5-9f70ea8b2782/what_should_my_salt_cell_be_set_at.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc1e1194-3087-45b1-8707-21c144ec4efe/infinix_note_4_price_in_nigeria_jiji.pdfIn PDF document text
    • http://fufitan.pbworks.com/f/wwe_2k17_apk_file_download_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eb11c22-ebb8-48f8-9851-adc67a9aa5ce/vekanekukokunesijuwuxam.pdfIn PDF document text
    • http://podimil.pbworks.com/f/123musiq_tamil_mp3_songs_free_download.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 8

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_off000127f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F8 5188 bytes
SHA-256: d56fda8aeae4115218c390ecb092bdf18f8389d8e58b0bb086ad43208142c3e5
font_01_sfnt_off00013982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13982 12968 bytes
SHA-256: e57b58cbd648b2cc40829715f8084f8bfe31cb9a9585a267b71a5b90b4bf485c

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