Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a08f657b18a9001…

MALICIOUS

PDF

78.4 KB Created: 2021-02-13 20:12:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: fce4b6266f6a93fa2603838e5d454d00 SHA-1: 9714b610e1eabdad7d671b48a7449610b64c1602 SHA-256: 6a08f657b18a9001a11e58da51a36255d43ac8119f8665ec0f8f2790f2bbac0a
66 Risk Score

Malware Insights

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

The PDF file contains an embedded URI that redirects to a link farm hosted on disposable domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier also flagged the PDF as malicious with high confidence. While no scripts were extracted, the presence of numerous external links and the ML detection suggest a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/aws?utm_term=inkjet+sticker+sheets PDF link annotation
    • https://begazasageb.weebly.com/uploads/1/3/1/6/131637419/cea03569d3962.pdfIn PDF document text
    • https://xuzomavarek.weebly.com/uploads/1/3/1/3/131383242/6671455.pdfIn PDF document text
    • https://cdn.sqhk.co/wumidimux/ficgeWO/25019605755.pdfIn PDF document text
    • http://womumonafip.22web.org/isobutyl_chloroformate_synthesis.pdfIn PDF document text
    • https://cdn.sqhk.co/waxipefimafa/aFXKjep/free_splash_pad_parks_near_me.pdfIn PDF document text
    • https://wubinuju.weebly.com/uploads/1/3/4/6/134642725/f4ca94c23ce4.pdfIn PDF document text
    • http://gateguge.22web.org/gesubuwurodujilena.pdfIn PDF document text
    • https://ladunibik.weebly.com/uploads/1/3/4/0/134096621/fewasiwizufefik-luwivej-wosuvoj-wipelobok.pdfIn PDF document text
    • https://cdn.sqhk.co/redusebi/jizgenb/toman_to_usd_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/rigizisojix/MIgg1Hi/pop_rock_music_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/kubafipefo/hvDhgHR/81124174835.pdfIn PDF document text
    • http://sifasawiseziwi.iblogger.org/wedding_guest_list_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bokofapig/36140498945.pdfIn PDF document text
    • http://relisedozoru.epizy.com/2909690538.pdfIn PDF document text
    • http://zisoramemib.rf.gd/academic_reading_test_3_caves_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/critical_ops_hack_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/39456548757.pdfIn PDF document text
    • http://zakifatuvosi.rf.gd/37134391596.pdfIn PDF document text
    • http://deketinak.rf.gd/40900359891.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_off0000f7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C9 4724 bytes
SHA-256: 1ced34cd0b210d336b8643f738639ee6e425c3777bed85f37c4907d2a11289e7
font_01_sfnt_off000107db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DB 10780 bytes
SHA-256: 36a421bbcc2442b516a4ae1da22b312871d89885d5b07a26eddd94d1f4a19c6d

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