Malicious PDF — malware analysis report

Static analysis result for SHA-256 92c3c27334674429…

MALICIOUS

PDF

68.3 KB Created: 2021-03-05 02:08:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d86642a126f4dddc8a3cbdea09202ef2 SHA-1: 8abbb92862470045b08b883ea1fbc7982f9e65ed SHA-256: 92c3c273346744295ee39aa179b689b3143b14a380a1016802cecd5acf022d3d
186 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or redirection scheme. The primary URL found is https://maypoin.ru/wix?keyword=arithmetic+and+geometric+sequences+puzzle+answer+key, which is likely part of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://maypoin.ru/wix?keyword=arithmetic+and+geometric+sequences+puzzle+answer+key PDF link annotation
    • https://wipigoxexidon.weebly.com/uploads/1/3/2/6/132682030/wipiwat.pdfIn PDF document text
    • http://piredvizhnik.com/terraform_ecs_blue_green_deploymentseajp.pdfIn PDF document text
    • https://lukigozijejis.weebly.com/uploads/1/3/5/3/135398738/bakuwikod.pdfIn PDF document text
    • https://xikaxuroloxo.weebly.com/uploads/1/3/1/4/131406092/bonivadesug-tesadegubu.pdfIn PDF document text
    • https://defejeve.weebly.com/uploads/1/3/4/3/134386135/b993349d814.pdfIn PDF document text
    • http://yoga-italy.space/ejemplos_de_alcanos_ramificadosdnxff.pdfIn PDF document text
    • https://remezovegaz.weebly.com/uploads/1/3/1/4/131406605/1ab50feab.pdfIn PDF document text
    • http://goproits.com/dijuwogemunilakqr1tx.pdfIn PDF document text
    • https://pufenenuboz.weebly.com/uploads/1/3/0/7/130738511/4a71ca40.pdfIn PDF document text
    • https://moxigowa.weebly.com/uploads/1/3/0/8/130814106/5945179.pdfIn PDF document text
    • https://sirewuri.weebly.com/uploads/1/3/5/2/135298631/6128498.pdfIn PDF document text
    • http://yandex-dostav.ru/sufolotykv.pdfIn PDF document text
    • http://instas.site/how_long_is_cpr_certification_good_for_red_crossqnxsu.pdfIn PDF document text
    • http://lnstagramverifiedbadgeshelpcenters.net/344870109lakrc.pdfIn PDF document text
    • http://romeita.space/diary_of_a_wimpy_kid_movie_2010_online9oo7f.pdfIn PDF document text
    • http://netzamka.ru/programa_de_mantenimiento_preventivo_de_maquinas_y_equiposvhoja.pdfIn PDF document text
    • https://gasuzenop.weebly.com/uploads/1/3/4/2/134266144/moxagu.pdfIn PDF document text
    • http://douchely.xyz/38147321545j2eyt.pdfIn PDF document text
    • https://zisamezasebav.weebly.com/uploads/1/3/3/9/133997726/5766154.pdfIn PDF document text
    • https://puwoposujol.weebly.com/uploads/1/3/0/9/130969317/vewox.pdfIn PDF document text
    • http://presalon.xyz/dizunixagonalavezibopasal3g5n.pdfIn PDF document text
    • http://garant-ritual.online/90302440707ysmhp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cd63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD63 5908 bytes
SHA-256: 20e4d4150907962e06cc804a964bf39b224e7e6e922c6df86aa4709e2f6b18a2
font_01_sfnt_off0000e170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE170 9888 bytes
SHA-256: b1ba9461697e991a2d05ecef4bfa8c4b38f453ac14ee90ac96efeeb9a5762018