Malicious PDF — malware analysis report

Static analysis result for SHA-256 2656370298c0bef8…

MALICIOUS

PDF

77.8 KB Created: 2021-02-20 03:48:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6d1e2943c8190436f2dfc96dfb87d67d SHA-1: c2256e7af61ed05b5c5ee3b8a8d94f795e1b9cc1 SHA-256: 2656370298c0bef813822d37ca761bee4aea653ed22adf07aec081546a464da7
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to various PDF files hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the structure and numerous external links are indicative of a malicious document.

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://jottigo.ru/wix?keyword=puffle+rescue+stamp+guide PDF link annotation
    • https://xekafifem.weebly.com/uploads/1/3/4/6/134669887/tegoxinolamipop.pdfIn PDF document text
    • http://getsol.xyz/jolufasupusixan7q453.pdfIn PDF document text
    • https://wetarotener.weebly.com/uploads/1/3/0/8/130813606/e6c60b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465694/normal_5fdba70d53cd3.pdfIn PDF document text
    • http://useporte.xyz/porque_una_mujer_no_sangra_cuando_tiene_relacioneskw4jt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368481/normal_5ff0730842ea5.pdfIn PDF document text
    • http://mikrotikwizard.com/hawkes_learning_viewing_life_mathematically_answerso6akn.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/jQhhzjg/66118734903.pdfIn PDF document text
    • https://milelujip.weebly.com/uploads/1/3/4/8/134861654/kumizuweku.pdfIn PDF document text
    • http://sayseedokg.com/hyptis_suaveolens_medicinal_usesjidxc.pdfIn PDF document text
    • https://xiramulume.weebly.com/uploads/1/3/2/6/132682542/672a5b86f.pdfIn PDF document text
    • https://faxezufag.weebly.com/uploads/1/3/0/8/130874059/489c602d92.pdfIn PDF document text
    • https://kutinimi.weebly.com/uploads/1/3/4/6/134608846/4c87b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384461/normal_602bf453ce1f5.pdfIn PDF document text
    • http://verenica.net/coaster_design_template_freelix03.pdfIn PDF document text
    • http://uscovidcharts.com/need_for_speed_most_wanted_android_ps4_controller354ru.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/bbz9dic/super_truck_racer_wii.pdfIn PDF document text
    • http://kefets.xyz/82016634166l16wk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47E 5476 bytes
SHA-256: 7676b96b5c0966aec88736da596c45eaf9d6736ab022699871f47ce71d5e1c5a
font_01_sfnt_off0001070a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070A 10184 bytes
SHA-256: b4fd7ba442bb6bd070e6c7e2b06dd5e439338e7e160d656a22d2aba0570a46a7

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