Malicious PDF — malware analysis report

Static analysis result for SHA-256 c920f6014db9a3d2…

MALICIOUS

PDF

73.8 KB Created: 2021-04-08 07:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 014da3ae3ff2863d3b742028b104bb33 SHA-1: 57031357bd23f2935f452409c7023cdaf31031ad SHA-256: c920f6014db9a3d2fe55d8a10c0bea560a17d831640a1bbeb06aaaa979e84400
66 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 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 0.9997

Heuristics 4

  • 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://baarspo.ru/strik?utm_term=excel+online+onedrive+login PDF link annotation
    • https://cdn.sqhk.co/fezivabuja/M8ghRje/f1_tv_schedule_monza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470961/normal_5fcf665fd788c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369509/normal_5feb74bc18d62.pdfIn PDF document text
    • http://zolozabaxozafa.iblogger.org/introduce_yourself_in_interview_example_for_freshers.pdfIn PDF document text
    • https://cdn.sqhk.co/mojafefegamo/feBhdWX/13020933574.pdfIn PDF document text
    • https://cdn.sqhk.co/wadebekop/fMf1jj3/chromecast_built-_in_tv_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/zenegiwowi/chdNt28/lirorebavabapeg.pdfIn PDF document text
    • http://nijeratazuw.iblogger.org/game_bully_ps2_android_mod_apk.pdfIn PDF document text
    • http://tasenatalagotur.22web.org/zolowinegomiv.pdfIn PDF document text
    • https://cdn.sqhk.co/nomuzali/fwAih96/khleo_thomas_movies_list.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/aSLjhhf/hmrc_self_assessment_tax_return_calculator.pdfIn PDF document text
    • http://jiwutovafigeze.22web.org/jegexesoz.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzitomizaj/jdjaias/45062335853.pdfIn PDF document text
    • https://cdn.sqhk.co/dolafita/fdE2Cgj/seesaw_app_icon_image.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/29316c64-2d3f-4dcb-936c-b9b8dab743b7/3d_flexagon_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eff8aded-07a5-4b01-9058-15ec3fed7a4f/free_life_book_templates.pdfIn PDF document text
    • http://sanebofav.epizy.com/kisonupiwoz.pdfIn PDF document text
    • http://dosevidi.rf.gd/wurusupigovenuzanetuzaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4bc5957-aa0b-4835-b659-e8896241c6b6/dajuseses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6a404a9-fa26-4367-881c-4a2b741cced6/bidaxulirofal.pdfIn PDF document text
    • http://tuvebiz.rf.gd/bewotulumumo.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_off0000e642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE642 4804 bytes
SHA-256: 1ff87a4a2f8e523e14729f5a6e93d1f4444a1e86a96798db479063e8fcb0612e
font_01_sfnt_off0000f6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B7 10236 bytes
SHA-256: d0fa667d897d2099ed0663f259004311c06244cec4cf82a66048b6aa1c1f3b4e

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