Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e6fd8a8e8072a58…

MALICIOUS

PDF

65.9 KB Created: 2021-02-25 21:26:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bcf8cf3512b8af3049a87ed549de98e8 SHA-1: 0fa1d09534c39e9a1a9143a8127cd23d2150d6c8 SHA-256: 7e6fd8a8e8072a58644da575d4bcbebb941df7f575e77cd8a68b0a72b1128fe2
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable hosting services like Weebly, indicating a link farm designed to redirect users. The presence of a link to known malicious redirector infrastructure further supports this. While no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings strongly suggest a phishing or scam attempt to lure users to malicious sites.

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
  • 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 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.
  • 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=shopmaster+delta+s26-261ls+sliding+miter+saw+and+stand In PDF document text
    • https://teselabobebivu.weebly.com/uploads/1/3/1/6/131606188/jinewunalopi_kumivunowoweke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368996/normal_6012a6f854315.pdfIn PDF document text
    • https://levukuwaxumofet.weebly.com/uploads/1/3/1/3/131383949/7173889.pdfIn PDF document text
    • https://natutiwuv.weebly.com/uploads/1/3/6/0/136019317/4344868.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/dusilujixo.pdfIn PDF document text
    • https://zafasasuk.weebly.com/uploads/1/3/4/7/134713251/saximapamekenabujo.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/RidCgdg/lucky_block_minecraft_pe_addon.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/best_dance_music_in_2020.pdfIn PDF document text
    • http://paselon.getenjoyment.net/how_do_i_remove_demo_mode_sony_bravia.pdfIn PDF document text
    • https://foguzutaporoma.weebly.com/uploads/1/3/5/3/135322660/garebuzukok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/befafuni/busqueda_por_voz_google_apk.pdfIn PDF document text
    • http://mesesoriran.epizy.com/jemejijiwatixiwajaw.pdfIn PDF document text
    • http://zutugidod.onlinewebshop.net/present_continuous_tense_worksheet_with_answers.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_off0000c2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2CC 5940 bytes
SHA-256: 8c666d40da8cdd4eb47bfab5466380856909765d6d07f2d9e955a03648ec8b41
font_01_sfnt_off0000d6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EE 10528 bytes
SHA-256: 569a9a0ad551f4ee54def61130f7121fa4a4a9f653ccebee4622c726075d5c5d

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