Malicious PDF — malware analysis report

Static analysis result for SHA-256 38d57119ec4d9600…

MALICIOUS

PDF

76.3 KB Created: 2021-03-19 03:55:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 215d533eaebbc7f4021e599f585138c8 SHA-1: a8b784b426afa307f097eb92f4310c0456609579 SHA-256: 38d57119ec4d960038cfd04a21213362afb07ed136a5ee41447ccb270f84306a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, embedding a large number of URLs within the PDF document body, many of which point to disposable hosting. This suggests the primary goal is to redirect users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/award?keyword=similar+triangles+ncert+pdf PDF link annotation
    • http://bokaxakoz.sportsontheweb.net/punctuation_comma_rules.pdfIn PDF document text
    • https://cdn.sqhk.co/dopuwene/ghjwYWI/dragon_quest_dai_no_daibouken_2020_opening.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/CXlHjh9/continuous_service_improvement_plan_template.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/gdhaDje/lucky_block_mod_minecraft_1._8._9.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/hannah_arendt_livro_a_condio_humana.pdfIn PDF document text
    • http://pewadulojuba.mypressonline.com/punitaxasudepubalidaro.pdfIn PDF document text
    • https://cdn.sqhk.co/bopelara/8gdibie/21802164457.pdfIn PDF document text
    • https://cdn.sqhk.co/tewokozogop/gjAHyjh/juzusijafasutolepafagugum.pdfIn PDF document text
    • http://vibubag.22web.org/tepung_ampas_kelapa.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/giTLjeR/shooters_waterfront_brunch_hours.pdfIn PDF document text
    • http://vojumugojiliwa.iblogger.org/xepoxugilinifu.pdfIn PDF document text
    • https://cdn.sqhk.co/setanutoba/Kigiehb/50054264628.pdfIn PDF document text
    • http://saporik.scienceontheweb.net/vuzolawima.pdfIn PDF document text
    • http://julivojurukumu.sportsontheweb.net/how_much_is_a_2007_ford_focus_worth.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/273318ac-3fbd-431b-9118-c425f035d9bf/pete_the_cat_school_shoes_animated.pdfIn PDF document text
    • http://xowobovu.myartsonline.com/explain_how_to_use_the_standard_normal_table_to_find_the_probability.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd0d0c3b-4940-4898-a799-d86a5d04434e/levegeleze.pdfIn PDF document text
    • http://nogafojomor.onlinewebshop.net/21181154831.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c6f613e-81e2-4d47-bddf-9733ffbc5d18/lamborghini_gallardo_lp560-4_spyder_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/548c12af-013e-4729-9db6-c076c111218c/94170010360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/491bf8b1-0e94-45d9-b3a7-b500089dcf76/difizizeliwibubugidatote.pdfIn PDF document text
    • http://zezajezo.epizy.com/zovabuliritinezuxuriz.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_off0000ec46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC46 5580 bytes
SHA-256: d3ef53f57e8cee22fe06f5531d710686af5deae6aec7ef565485507ad55d087a
font_01_sfnt_off0000ff26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF26 10892 bytes
SHA-256: 0358e16c1e418dc7c0d16ad227d55d633a3dbb98cc64a130ef01174db2ebebdc