Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b64cc448c78a31…

MALICIOUS

PDF

77.7 KB Created: 2021-03-27 20:28:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7b57ad8261a09c9da7f6b9d05239bb57 SHA-1: b05b1044a5f0d4557cfa094793fd97529b5a287c SHA-256: 28b64cc448c78a31f76fed1d4534dc9f7a7af95b0477d26ba0d190e9a52b7afe
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 0.9993

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://druttle.ru/123?utm_term=responsive+coming+soon+page+html+template PDF link annotation
    • http://esclub.pro/filme_romanesti_vechi_cu_razboi4yflf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473938/normal_6013e6e19d4c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454179/normal_5fd3dc0f868f6.pdfIn PDF document text
    • http://de-bewertung-889562.icu/zitiligulugobikl9i.pdfIn PDF document text
    • https://degitigurot.weebly.com/uploads/1/3/4/3/134337886/fab059cff8.pdfIn PDF document text
    • http://natural-shop.info/gogoxejuzutuxaramu9oov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467036/normal_6027a90e1f59d.pdfIn PDF document text
    • https://ludolukek.weebly.com/uploads/1/3/4/6/134699908/4314a6.pdfIn PDF document text
    • https://dafizigupiteg.weebly.com/uploads/1/3/4/4/134492389/2459764.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389108/normal_5fe5cfaa48657.pdfIn PDF document text
    • https://giwitororozesal.weebly.com/uploads/1/3/4/6/134652081/c81295c7e671f.pdfIn PDF document text
    • http://idealslimitalia-oficial.site/how_to_make_6_figures_online_20187iqqz.pdfIn PDF document text
    • http://betmoy57.com/english_worksheets_for_grade_5_conjunctionsmo6ln.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414161/normal_6005334e3d0aa.pdfIn PDF document text
    • http://bloomwithdeanna.com/taxokokofixexul4etx.pdfIn PDF document text
    • https://depuxozepol.weebly.com/uploads/1/3/4/3/134377374/4855411.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/95dbd171-18d5-4331-a9ad-768798023e95/inorganic_chemistry_courses_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9bc6679-96c5-48c6-8c0b-74c5110b3d58/sentence_of_idiom_dead_to_the_world.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f208b858-e7be-4ccd-8217-924f0c8a7bd0/weider_pro_4950_assembly_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eabf66d-8c0b-402c-9905-bf2c96a39696/howling_gale_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75627e73-1416-47c3-b03f-fd3b0c2cf724/how_to_hook_up_cosco_booster_seat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57de7740-6eab-4de5-925c-51832a72e39a/how_to_forgive_an_unforgivable_act.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/339bb3e5-d2e2-4750-9e67-bf994a919006/wevefadogafum.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_off0000f322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF322 5316 bytes
SHA-256: b2c6ccefeb3ae42c9da0657f1d023ae0521ff032df03ab8a252ddd3c83a63cbe
font_01_sfnt_off00010523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10523 10572 bytes
SHA-256: 873d71c74ccac50ae00021b6b5ff97fdf6144538f0aedd43d5e90a346088a130