Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e4c588a6d06b63f…

MALICIOUS

PDF

79.4 KB Created: 2021-05-02 05:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 59cffc66e7ab23b8d33f48cef6803ef7 SHA-1: 021772147c2c0bcdb4332483660411fcbe289c80 SHA-256: 1e4c588a6d06b63f662b802bece71c9770e73933b92fed8b6509a33628d67ad4
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to manipulate search engine results or host phishing content. The presence of embedded URLs further supports this, directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=what+is+the+importance+of+varied+teaching+strategies PDF link annotation
    • http://zokugorevat.mywebcommunity.org/manual_de_codicia_brontis_jodorowsky.pdfIn PDF document text
    • http://gepopusoka.mypressonline.com/nutricion_y_alimentacion_de_animales_d._c._church.pdfIn PDF document text
    • https://wovadipe.weebly.com/uploads/1/3/4/4/134462462/xusuwevafejawip_kixumed.pdfIn PDF document text
    • https://fudegedetet.weebly.com/uploads/1/3/4/7/134733785/20ad87f5a.pdfIn PDF document text
    • https://sivajusirev.weebly.com/uploads/1/3/0/8/130814673/3444d6b3198f6.pdfIn PDF document text
    • https://muvisodujop.weebly.com/uploads/1/3/4/3/134358588/119000.pdfIn PDF document text
    • https://jutewalezozapon.weebly.com/uploads/1/3/4/0/134016751/4105879.pdfIn PDF document text
    • http://mosomupusafebin.medianewsonline.com/algebra_2_factoring_practice.pdfIn PDF document text
    • http://sigixexizo.sportsontheweb.net/xemenatalubujivu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://21d44941-995c-48b9-956b-8145330e20d5.filesusr.com/ugd/577b75_92a3af6de58142ca93a4cb070be9ccdc.pdf?index=trueIn PDF document text
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_35c9412d046d4d4187b80b4d09fe5ef3.pdf?index=trueIn PDF document text
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_ab1df83eecfa46169bf24f75d2dde588.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kovezux/rogigapajolatofavuxevojow.pdfIn PDF document text
    • http://baxewape.myartsonline.com/28538577706.pdfIn PDF document text
    • http://tosabukevosubar.myartsonline.com/free_converter_to_word_for_mac.pdfIn PDF document text
    • https://6f12065f-c45d-410c-b048-6ec23fb2b810.filesusr.com/ugd/02ccf7_f1c713b8ff414ab298eafd39cfde5be1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gawabog/nemaralotodoxuzigofopufi.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/47609491557.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/88487692460.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/devazaraxowojudasogakowi.pdfIn PDF document text
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_ca7a6b86f3894159893e08d58bc53745.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93F 5608 bytes
SHA-256: b344493f2aa90ed360f2ba985f62cc51eb98745acf2c049923ac9d079e47c85e
font_01_sfnt_off00010c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3F 10336 bytes
SHA-256: a5389846436d45d50f56789a3726f3d97117d7e0ed130447537e8784f0797429