Malicious PDF — malware analysis report

Static analysis result for SHA-256 32c0f8c8edd8605c…

MALICIOUS

PDF

80.7 KB Created: 2021-02-12 13:08:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 3a868ce1f9c231e5afa1a723e96d1cc7 SHA-1: 51694ddc85ee39d8ea562eff3371afbc46e89a3c SHA-256: 32c0f8c8edd8605c5dc96aeff9da406fd8a9270bd9e67ce5653abcd34e44ff87
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier strongly suggests maliciousness. While no scripts were explicitly extracted, the presence of numerous external URLs suggests the document is designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://baarspo.ru/wix?keyword=ruins+of+alph+guide PDF link annotation
    • https://mefufexuwi.weebly.com/uploads/1/3/4/0/134019004/fisubedanif.pdfIn PDF document text
    • https://cdn.sqhk.co/bebubofawa/Ljg5GX8/dark_sword_dark_souls_3_build.pdfIn PDF document text
    • https://cdn.sqhk.co/visobipibe/jLVieK7/the_wolfpack_where_are_they_now_2018.pdfIn PDF document text
    • http://babarogumo.iblogger.org/carcinoma_neuroendocrino_de_pancreas.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/iWheMQD/video_editor_and_video_maker_inshot_which_country.pdfIn PDF document text
    • https://sipedevete.weebly.com/uploads/1/3/1/4/131438766/7d22b7c.pdfIn PDF document text
    • https://fefajuvojamunuj.weebly.com/uploads/1/3/4/7/134750085/161855.pdfIn PDF document text
    • https://robesiladobaluj.weebly.com/uploads/1/3/0/8/130813577/4385489.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/djjohak/lofere.pdfIn PDF document text
    • https://vuvunovugigadi.weebly.com/uploads/1/3/0/8/130814714/b6d7bacce.pdfIn PDF document text
    • https://jamakebowixon.weebly.com/uploads/1/3/4/4/134477175/mivifizo.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/AjiaPhj/snapchat_streak_ideas_funny.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/hbjbgdo/ice_cream_vans_for_sale_on_gumtree.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/dosipive/xemetigu.pdfIn PDF document text
    • http://depepok.rf.gd/65951880639.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB6 4428 bytes
SHA-256: 4b0b3e465fb7b932ac661e7be0de469ea60c710d402e6dd3b59d93950b9d7247
font_01_sfnt_off0000ff40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF40 5216 bytes
SHA-256: b8a7620ae3ef5b32b6ee2f1a89eb41c4ead5f493371e05d91d396e67ab6f2f5b
font_02_sfnt_off00011105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11105 10756 bytes
SHA-256: 26a771cb1f8fdccb15120ab66000305bb6548d02c061cbe2f85ff0f523bdc478

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