Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c88b8d58334c614…

MALICIOUS

PDF

77.2 KB Created: 2021-05-30 07:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1d263adfe74dcc1ea8dabc5658ec5791 SHA-1: cd3aea7549bc0110171a6518473b07680c316816 SHA-256: 4c88b8d58334c6147e408c360a733a973017ad069509ab45f53471e2bb2f3a07
186 Risk Score

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 0.9956

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://dugedepap.ru/strik?utm_term=whirlpool+ultimate+care+ii+won%2527t+drain+or+spin PDF link annotation
    • https://duveniwapawas.weebly.com/uploads/1/3/4/2/134265961/7844c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375890/normal_6052bac209867.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402722/normal_5ff9a6ed978a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414515/normal_600b5cae6877b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374986/normal_605440610e0e8.pdfIn PDF document text
    • https://jewefero.weebly.com/uploads/1/3/1/3/131383264/wosejakezori_devebibonozovor_karamevujowi_janunupejo.pdfIn PDF document text
    • https://kigowekaferal.weebly.com/uploads/1/3/4/5/134513301/galazumarerap.pdfIn PDF document text
    • https://kogewovedof.weebly.com/uploads/1/3/4/3/134339257/46299c9637f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500670/normal_603e73cee5112.pdfIn PDF document text
    • https://pirowefe.weebly.com/uploads/1/3/4/4/134444143/8837135.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375716/normal_605303ef0cacf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484118/normal_6041cafab7458.pdfIn PDF document text
    • https://pumaxodevuk.weebly.com/uploads/1/3/1/8/131872084/gozetupolil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404969/normal_6000643a7604d.pdfIn PDF document text
    • https://lonoguvuxa.weebly.com/uploads/1/3/5/3/135320471/nogufirinizuxidokuxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405186/normal_5fe875cab2363.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/5cd7dcff-181b-4f78-880f-67c2584b0c69/robert_greene_quotes_mastery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28a345fe-66f6-4afc-9127-4367d3a34fb3/nutemulaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a191bbfd-dfcf-4040-87c3-ad0507a77e68/sifavalomub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ca7ee3b-3fe4-4127-aee0-7f4f650afaa7/proper_way_to_write_address_in_ireland_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/575d1776-1efc-4ee0-a2f6-1bac8aba5722/kosujizuwizovodefufakik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b58ac5b-dcd1-403c-afbc-3b8c4ff0921b/logitech_surround_sound_speakers_z506_rear_speakers_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fd03c6f-a30b-4a84-8050-fada0aa5c3c9/how_to_get_to_stairway_to_heaven_nj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad6fcc40-c1d3-410d-9861-4fb120dcc318/what_is_the_theme_of_fried_green_tomatoes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/829d6dc6-f9ac-4109-9181-9b884128017d/the_new_testament_apocrypha.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3f828c2-b435-43ee-8390-808724600a8e/holy_bible_niv_meaning.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_off0000f065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF065 5452 bytes
SHA-256: 6464c4f8ba5dea52c1809afb81797c3a8f1285d151aae1ab581b24e039ece651
font_01_sfnt_off000102d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D7 10528 bytes
SHA-256: a9fe944c63daedbcfc962b419198f8a8a0d80b158ac5ece6553cbeb34ead2fc8