Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a5abea4d2ecbd4…

MALICIOUS

PDF

74.8 KB Created: 2021-03-12 03:46:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: cfc88e3855f7e21c4ba29f3636ace7a9 SHA-1: b1b36dc9dcef42d514cfa3021f33a15633845ba5 SHA-256: a8a5abea4d2ecbd4773f62341228c91bfaf9e09dec043e6817305f2e4781164c
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment, likely leading to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://maypoin.ru/123?utm_term=powerpoint+flowchart+free+template PDF link annotation
    • https://cdn.sqhk.co/fobonelaga/37ieyvv/ximepalubazemopowifika.pdfIn PDF document text
    • http://akb54.ru/13475210639on1ks.pdfIn PDF document text
    • http://belplitka.ru/6594691642582frw.pdfIn PDF document text
    • https://gamajebijapam.weebly.com/uploads/1/3/1/8/131856653/7795212.pdfIn PDF document text
    • http://kluruu.info/vidmate_free_for_pc_appsqan3o.pdfIn PDF document text
    • https://zivejopoji.weebly.com/uploads/1/3/4/2/134266783/lebajone.pdfIn PDF document text
    • https://cdn.sqhk.co/nunewole/Nhdl5id/minecraft_zombie_pigman_farm_1._12.pdfIn PDF document text
    • http://matroskin.space/advancing_vocabulary_skills_chapter_21_answers1f4dw.pdfIn PDF document text
    • https://cdn.sqhk.co/wepiwuvume/jiagcig/ocotillo_cactus_images.pdfIn PDF document text
    • https://cdn.sqhk.co/zovaratigu/bx6BaPZ/85578068710.pdfIn PDF document text
    • https://gugagefa.weebly.com/uploads/1/3/4/3/134343265/jokizimigije.pdfIn PDF document text
    • https://cdn.sqhk.co/muvetowiripa/ifxzjgG/muxopabopoxaxovizupotix.pdfIn PDF document text
    • https://cdn.sqhk.co/lajakukilo/gjvhhja/78131685498.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bidetorula.rf.gd/76731901520.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/3287492561.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/super_teacher_worksheets_making_a_line_plot.pdfIn PDF document text
    • http://wujuxupizosafe.rf.gd/game_templates_unity3d.pdfIn PDF document text
    • http://senoburem.epizy.com/rotenobiwufipe.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/philips_smartsleep_hf3520_60.pdfIn PDF document text
    • http://jumazimedu.rf.gd/72899836828.pdfIn PDF document text
    • http://bitoliwutusire.epizy.com/rawapk_showbox_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/bluecoat_beechdale_academy_uniform.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_off0000e73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73E 5168 bytes
SHA-256: bf23b32769759f878daf54081ccf9970b9d3b20efd3a2af45f8074ae653b92d7
font_01_sfnt_off0000f8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BE 10748 bytes
SHA-256: 83bb0cae4ebe57e41ca776f708068ee04f23c0bd6f7c70746cee56d5c52f74a3

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