Malicious PDF — malware analysis report

Static analysis result for SHA-256 56bc2a4194d9f796…

MALICIOUS

PDF

76.9 KB Created: 2021-02-26 02:29:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: faf3d078a0fb1c4f8a6e7033aac1c9a2 SHA-1: d901e82a8e5828d5e094dae3b9fa4ba262fc18cd SHA-256: 56bc2a4194d9f7969621a7ac7b515eaae45b5a619223253cf6d218624890a168
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains embedded links that redirect to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=what+is+a+letter+called+in+math In PDF document text
    • https://static.s123-cdn-static.com/uploads/4404750/normal_5fc5b563d8dbe.pdfIn PDF document text
    • http://pshcomonhere.xyz/gelujexitokf3oum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497348/normal_5fd7c14a96f63.pdfIn PDF document text
    • http://navalny.design/cambridge_fce_handbookzf5lw.pdfIn PDF document text
    • https://cdn.sqhk.co/dawadetugas/jhj3YC1/jelekanokoreloxodibi.pdfIn PDF document text
    • https://cdn.sqhk.co/kadukugobug/shdjgWA/vulisemapa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449185/normal_5fe5048ebbdc6.pdfIn PDF document text
    • http://muguwadijalipov.22web.org/15221642833.pdfIn PDF document text
    • http://smm-target.ru/petty_cash_voucher_formatpbvet.pdfIn PDF document text
    • http://vanesifonemume.22web.org/circus_animals_coloring_sheets.pdfIn PDF document text
    • http://wivejudotimog.22web.org/51326763766.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415783/normal_60146aec761d2.pdfIn PDF document text
    • https://cdn.sqhk.co/fojizejoxu/gqLtZpf/stick_war_legacy_samurai_mod_apk_download.pdfIn PDF document text
    • http://nimidarizul.22web.org/free_lawn_care_logo_templates.pdfIn PDF document text
    • http://im-marceting.site/senijexumusixixanegarovasjhfg.pdfIn PDF document text
    • http://nesorus.mywebcommunity.org/81056106918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381532/normal_6030875c9909c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393041/normal_5fdb85b1a9972.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444092/normal_602b3a08a6e29.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jisijuvod.myartsonline.com/58862182087.pdfIn PDF document text
    • http://kowexefuwuron.rf.gd/free_medical_dictionary_for_android.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_off0000efb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB5 5192 bytes
SHA-256: 4b3c2e0fed1ce73905dc2e7c6f5da3ef2b2db1f858f8b5ebae8481fc452ffb1a
font_01_sfnt_off0001013a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013A 10872 bytes
SHA-256: 3b868807e4533c54d3a4d3dca8b85dc4e0177188a64a8e4c107d419235d921c2

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