Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed4c7d2f511837e5…

MALICIOUS

PDF

88.0 KB Created: 2021-06-14 03:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: da67b1c8405551f0d9cb77dc5bef57f0 SHA-1: 541106a655ff8734e117cd5aff5235fc5479c51d SHA-256: ed4c7d2f511837e5f039e612ec74a4631815f7c1cb8953e89fd3d6f27ccb33b6
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with several pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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://seumenha.ru/123?utm_term=begs+the+question+formal+fallacy PDF link annotation
    • https://bovipapofubamo.weebly.com/uploads/1/3/4/3/134364795/a4fb29918.pdfIn PDF document text
    • https://vaxokivov.weebly.com/uploads/1/3/1/4/131453734/56162dd925a22.pdfIn PDF document text
    • https://nomalepizu.weebly.com/uploads/1/3/1/3/131398516/6320705.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470967/normal_5fef384a1c2a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404107/normal_60c64fb84af79.pdfIn PDF document text
    • https://towirakupafa.weebly.com/uploads/1/3/4/5/134595516/paxoliziko-dikasiwam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vibevekofano.pbworks.com/f/xutusiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc20d3d6-6331-4954-bcd6-4638141670a9/chrome_flash_player_plugin_blocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a4ad4d0-b091-449e-a17e-9692ba5a35e6/76095565168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fd20f96-69fc-419f-9c87-29759ffa635c/ripepofitixugobibuzozew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83e05f09-dfe6-44ef-b5f1-def862605e68/mubenar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08d3dbc5-3fba-4bb0-84ac-c75e7f2c5ea2/35499240936.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36ce79b2-f6e8-4472-af21-60367fac3dc5/sinikila.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92acb00a-4518-4b9e-a441-780e3807bd8b/adobe_premiere_pro_cc_2020_transitions_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4ac9c32-532d-4466-88b9-fa0b88103197/old_school_bagel_tulsa_delivery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6412b9f-41bb-4297-9030-1f015a3bd155/xosulizosekelenem.pdfIn PDF document text
    • http://bowawesup.pbworks.com/w/file/fetch/144829953/why_reverse_osmosis_is_bad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/005f48cf-ae3b-4e56-a78f-edcbd1e1a189/what_is_the_point_of_the_yellow_wallpaper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cf2138d-746a-4913-8aae-dabfaa0ec01b/blackbird_sheet_music_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9c9a181-d9df-4b8a-92e7-af8d978394e4/44116537354.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_off000111b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B9 5572 bytes
SHA-256: a77e05608116b9ce349228c2a0d490a37347ce241048ab18383b0f2efd4150b9
font_01_sfnt_off0001248f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248F 14596 bytes
SHA-256: 2e6418e8f429657cc5105e8cad42584aac0dc0f02f37724fa883f57aba5b4e0d