Malicious PDF — malware analysis report

Static analysis result for SHA-256 549a36bf36ac6a8c…

MALICIOUS

PDF

79.1 KB Created: 2021-02-26 21:02:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7d864b8a7301862e7b07d4cdf6832fce SHA-1: 913cb239828ed3014115cb15a5467452c344b28f SHA-256: 549a36bf36ac6a8c789ed7bbcdb69bbb7f99b7b2c6e030d8d75e5d2cdec49f75
192 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The presence of a 'download button' lure and numerous embedded links, some pointing to disposable hosting, suggests a phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious workflow designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/aws?utm_term=ace+academy+books+for+gate+mechanical+engineering+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4464523/normal_6017426fcc8c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382789/normal_6000d9c4c3591.pdfIn PDF document text
    • https://cdn.sqhk.co/lukulobu/ieR4tZD/vefulujasulozibututavit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421461/normal_5ff5ba5b3636b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387586/normal_60172211d9a5a.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/everstart_maxx_3_amp_6v_12v_automotive_battery_charger_bc3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487916/normal_600bc71f1eb03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475988/normal_601ed1de89da4.pdfIn PDF document text
    • http://vazawujuzu.sportsontheweb.net/xesatafivuwigixotisoz.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/eHgihih/44287084129.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408170/normal_5ff15d6d0b8cb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xizabefozuk.rf.gd/jozigosufiguduzotojubobo.pdfIn PDF document text
    • http://jezevenakos.myartsonline.com/fluke_t5_1000_vs_t6_1000.pdfIn PDF document text
    • http://ruxurosagogaru.epizy.com/rijegigeparofabopovuxa.pdfIn PDF document text
    • http://nopugorib.onlinewebshop.net/what_do_you_do_when_your_keurig_wont_brew.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF95 5864 bytes
SHA-256: 69c0b9405f1ab0c6594ca100913c431a75e2ef029140c707cb270a42ba4bf4e5
font_01_sfnt_off0000f371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF371 10988 bytes
SHA-256: 54e59747806f217de66a8df9b16b90d8f4bc89eb1827aaf184049116efc87583
font_02_sfnt_off00011929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11929 16284 bytes
SHA-256: e4528abf9f631edbdaa39a1253dd3c8b21b97940ab16465e976c6518305b1eab

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