Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3e6658fb5fdac3e…

MALICIOUS

PDF

74.8 KB Created: 2021-06-04 09:39:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6cb8865159c01aff083de65d212d23d3 SHA-1: d4845fc9327e4834d0f175fe258408b0d9a66c55 SHA-256: e3e6658fb5fdac3edfed6a39a753c378e6296234412899547425c36bc0bf1245
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, characteristic of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://irlanc.ru/pbw?utm_term=what+resolution+is+1024x768 PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4486521/normal_60b3bbb60857f.pdfIn PDF document text
    • https://gesamuju.weebly.com/uploads/1/3/1/4/131453574/468457.pdfIn PDF document text
    • https://mazerobuwi.weebly.com/uploads/1/3/1/3/131398334/598611.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471971/normal_606ad8e766514.pdfIn PDF document text
    • https://zivawopoxiba.weebly.com/uploads/1/3/4/3/134355714/kesatovem.pdfIn PDF document text
    • https://belinadojo.weebly.com/uploads/1/3/1/6/131607131/girufin-lafinemi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389793/normal_600e126037ab3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367287/normal_60245570862a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370284/normal_5ff6acda20985.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409405/normal_5fda5e928f349.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367281/normal_6013a19174bf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366623/normal_5fd2abb6850ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468820/normal_602deb6065532.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469631/normal_603b3cac2126f.pdfIn PDF document text
    • https://lobavasato.weebly.com/uploads/1/3/1/4/131483685/7cbb6.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/09a1dc69-6944-4a48-bc31-b523ca14f29e/75485468011.pdfIn PDF document text
    • http://vibasuvezuz.pbworks.com/f/31386945388.pdfIn PDF document text
    • http://gibuwodebu.pbworks.com/f/download_mencari_alasan_reggae_mp3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/612899ef-939f-41d4-ad1b-ef717a67aa9d/academic_vocabulary_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b1326be-9312-4e19-a21a-b4032e869755/onkyo_ht-s3700_5.1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c19c639e-5429-457d-aaec-6817d033cc2b/70674700743.pdfIn PDF document text
    • http://gatunam.pbworks.com/w/file/fetch/144557664/age_of_sigmar_seraphon_battletome.pdfIn PDF document text
    • http://redelaw.pbworks.com/f/suicide_squad_joker_song_download_free.pdfIn PDF document text
    • http://zipiwume.pbworks.com/f/amd_mobility_radeon_hd_5000_series_driver_download_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f44d5622-b095-4fb1-971e-f8a97a84cbd2/how_many_carbs_in_boy_scout_popcorn.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_off0000e553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE553 5696 bytes
SHA-256: 690c679abe957a308a0abb4c74fcfdcd254f2ec5e7254fdbea72909fb73c996e
font_01_sfnt_off0000f8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CC 10660 bytes
SHA-256: 469c821e0e3969ab077d631bac3a154a8553a8f269eb359a9060796954f99e5e