Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e6b1c6a30f07c6…

MALICIOUS

PDF

88.6 KB Created: 2021-03-22 22:12:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: de568ef7b9d1acffce87b310831e72d2 SHA-1: 690f74babba6679c688b639f650a494786d3e27a SHA-256: 87e6b1c6a30f07c6a06dad0012e9312c4c9f0c74a117e0b43c4e45fef3a099ef
192 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirection and link farming behavior, including a critical finding for a link to known malicious redirector infrastructure. The presence of a 'download button' lure further supports a malicious intent. Although no scripts were extracted, the document's structure and embedded URLs strongly suggest it's designed to trick users into navigating to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/123?utm_term=blade+bouncer+mod+apk+revdl In PDF document text
    • http://sixesijilolun.mywebcommunity.org/83597343160.pdfIn PDF document text
    • http://xekaminam.22web.org/best_interactive_reader_for_ipad.pdfIn PDF document text
    • http://leftoutclub.com/61983517558novqg.pdfIn PDF document text
    • http://fijexojor.getenjoyment.net/ashrae_psychrometric_chart_si_units.pdfIn PDF document text
    • http://mgacessoria.online/best_orhan_pamuk_book8adc1.pdfIn PDF document text
    • http://onsideball.info/bpx65_photodiode_datasheetz4k7v.pdfIn PDF document text
    • http://zukixulen.mypressonline.com/10726461892.pdfIn PDF document text
    • http://localdesign.me/cisco_sg300-10p_manualc4adb.pdfIn PDF document text
    • http://pusosokus.iblogger.org/obd_code_p0014_malibu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nujebij.onlinewebshop.net/wixaxerakenisused.pdfIn PDF document text
    • http://buzuvemujogumob.epizy.com/cake_pictures_hd.pdfIn PDF document text
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_0060e4619ff24a52a1f467c6f5422667.pdf?index=trueIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_fc4857fd8a4e4df0a3b20c6e5c7f09ec.pdf?index=trueIn PDF document text
    • http://xolagetomijured.epizy.com/approaching_literature_4th_edition.pdfIn PDF document text
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_26da7056daf84cb6b025a1db9df1dd2c.pdf?index=trueIn PDF document text
    • https://e108c0fa-8e70-4110-aab7-e0d30777705f.filesusr.com/ugd/d9966b_de42bad25f394215a374676dbf40aeed.pdf?index=trueIn PDF document text
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_ac43439b8dc04ddc813d057f8f2a9849.pdf?index=trueIn PDF document text
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_daa84539a69a49c38c571a9a32787639.pdf?index=trueIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EC 6744 bytes
SHA-256: 127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b
font_01_sfnt_off0000f8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D3 5356 bytes
SHA-256: 82f044022ba3fb96a8a57f633a1e2c08f99d9aa9a1d41949e4694994b3c6566c
font_02_sfnt_off00010aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEC 2044 bytes
SHA-256: 7819ef1de3348ad227e302ba7a5900f372fd4440a21f482bbf68fb1bc67eb97d
font_03_sfnt_off00011459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11459 12572 bytes
SHA-256: 7162e4ca9a7b32f70b4761c4270ffaeb432e0168431152cfffbfb7fb7aa3043e
font_04_sfnt_off00013e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E9B 16208 bytes
SHA-256: c691c2dc236ff1c3149f8178f30dcb30456d959af2bd230901b395ad55359d31

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