Malicious PDF — malware analysis report

Static analysis result for SHA-256 da46347e411387dd…

MALICIOUS

PDF

81.3 KB Created: 2021-04-03 22:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0432d0256e193bccec71b055562e4055 SHA-1: 71b05c6762104460fc23f7aa45796d4c74083794 SHA-256: da46347e411387dd8f738948e709ebd39535a35e86345eb9d6a00d8da9658d99
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://dafemum.ru/wix?keyword=area+of+segment+worksheet+answers PDF link annotation
    • https://relujebaxarun.weebly.com/uploads/1/3/1/1/131164257/3382219.pdfIn PDF document text
    • http://xepusuxewo.iblogger.org/asme_bpvc_section_ix.pdfIn PDF document text
    • http://peramabejakes.sportsontheweb.net/77950360480.pdfIn PDF document text
    • http://jotitojimo.mygamesonline.org/animals_and_their_homes_young_ones_and_sounds.pdfIn PDF document text
    • http://gafabotipunofu.mywebcommunity.org/acne_vulgaris.pdfIn PDF document text
    • https://lexugorubu.weebly.com/uploads/1/3/0/7/130776619/sofuriv.pdfIn PDF document text
    • https://tevupiju.weebly.com/uploads/1/3/4/8/134865653/xelewozudur_japowiwam_mapabu.pdfIn PDF document text
    • http://nokewobepasag.22web.org/what_was_the_significance_of_the_mayflower_compact_quizlet.pdfIn PDF document text
    • https://tigelulipuneve.weebly.com/uploads/1/3/4/7/134746657/254711b.pdfIn PDF document text
    • https://musixafura.weebly.com/uploads/1/3/5/3/135321149/dulukipe.pdfIn PDF document text
    • https://wilibupa.weebly.com/uploads/1/3/2/6/132681560/8523830.pdfIn PDF document text
    • https://zirubelazuzo.weebly.com/uploads/1/3/4/7/134747961/8866012.pdfIn PDF document text
    • https://kajizifobizixa.weebly.com/uploads/1/3/3/9/133997117/5155717.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://supajiwa.myartsonline.com/beowulf_full_text_modern_english.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/puritans_guiding_questions_document_b_answers_key.pdfIn PDF document text
    • http://moxixezegosa.onlinewebshop.net/bible_prayer_study_course_download.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/how_to_describe_a_poems_form.pdfIn PDF document text
    • http://wopifuvofuxa.epizy.com/sales_and_marketing_plan.pdfIn PDF document text
    • http://rodexiguv.onlinewebshop.net/atomic_mass_of_elements_list.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_off0000e84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84F 5292 bytes
SHA-256: f08dae91f8b624434d00a457785dfaad2ad18c63eb18997332e6a4ad3005aa6c
font_01_sfnt_off0000fa3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3C 11344 bytes
SHA-256: 022c1f9bc978990d0f2ec4d1c734c18c33acbf8a363be2a4d75087b392a64c01
font_02_sfnt_off000120f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F5 16616 bytes
SHA-256: 7ab81ce3d92a9ec80982bbbf7df4378fdf9290867a146be245f32411f9d17586