Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c20a13bb320472f…

MALICIOUS

PDF

83.6 KB Created: 2021-03-31 00:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 00eee01c622b4f50c1abdc914526fbb4 SHA-1: c5fd6c99d90a23d34ed772488944f98f4d8e593d SHA-256: 4c20a13bb320472fa0abdaa567c10e78447fc43ebc332714adbcb5f9375a91a0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a phishing or link-farming scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a T1566.001 (Spearphishing Attachment) attack pattern, aiming to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://botokaw.ru/award?keyword=eletroquimica+pdf+agamenon PDF link annotation
    • http://item-get.top/ad_hoc_reports_model0r28l.pdfIn PDF document text
    • http://eslife.pro/mortal_engines_2_bookem8np.pdfIn PDF document text
    • http://peludofnor.fun/telulututekezofowiret0dhy.pdfIn PDF document text
    • http://english-10.site/gegezakugodinezarokogezloieg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477921/normal_6041ee5baa5da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484632/normal_5fdd45e8537dd.pdfIn PDF document text
    • http://stylecurtains.com/is_the_arctic_ice_sheet_growingjqzvy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457006/normal_603f711176d06.pdfIn PDF document text
    • http://thelandofbadideas.com/western_digital_my_cloud_app_for_windows_10b62ef.pdfIn PDF document text
    • http://lnstagramverifiedsbadgesforms.com/element_60_inch_tv_costpx7k1.pdfIn PDF document text
    • http://pokemonrivals.online/95818863781opnxy.pdfIn PDF document text
    • http://esparks.ru/bohemian_rhapsody_piano_sheet_robloxbese0.pdfIn PDF document text
    • http://vufarilijofo.iblogger.org/95908522488.pdfIn PDF document text
    • http://japancar-sib.ru/693251023294jtm6.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/f0fe466f-1866-454e-b510-590f997bb518/vutemamajujifuveparip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39e25d36-aa5d-4347-98ad-303985924bf8/a_single_shard_chapter_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b30e518-c855-45bb-a850-1ab319c35f5f/28688171700.pdfIn PDF document text
    • http://suwifubol.epizy.com/a_thousand_splendid_suns_symbols_and_motifs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/281fe276-c966-4f84-a149-504977fd8d9d/66834050670.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_off0000fa9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9F 1684 bytes
SHA-256: 51fdace8bd53b7d2e6af2c0ab3a57c298b99a0f760d42a36c32010743562cd6d
font_01_sfnt_off00010303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10303 5380 bytes
SHA-256: 78ae8a8d84e78a0ee8020ab7e6f1fdfe3be81f7e0f72cc442705c471e4875252
font_02_sfnt_off00011539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11539 15140 bytes
SHA-256: a915237b0bae65c645201f0124f82884dc6ad20386b697b8057605b771732bf3

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