Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f3345b10fd8b3e…

MALICIOUS

PDF

67.0 KB Created: 2021-02-20 02:18:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: b690303dd9d3909e86cf585a77a5044d SHA-1: ffbab859d5da355f11f021aaf47f7dffa04dcea7 SHA-256: 91f3345b10fd8b3e25e1f2d599d701f7fd36266ea35779e30acbdc06a093a9a0
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links to other PDF documents hosted on various domains. The primary URL and several others suggest a phishing or SEO manipulation tactic, aiming to drive traffic to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://seumenha.ru/wb?keyword=moody%20bible%20commentary%20pdf%20free%20download PDF link annotation
    • https://gonufefimexej.weebly.com/uploads/1/3/4/8/134892828/9389998.pdfIn PDF document text
    • https://cdn.sqhk.co/makulowujip/ifU2rA0/hepatic_steatosis_symptoms.pdfIn PDF document text
    • https://pufokebisuniga.weebly.com/uploads/1/3/5/3/135324869/ginemuzofa_linowexajala_mimapojesewo.pdfIn PDF document text
    • http://idealica-it.website/zesimowogubeselavu7tib1.pdfIn PDF document text
    • http://sukalobuvigaz.22web.org/guia_ceneval_exani_ii_2019_contestada.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/PhicVgC/learn_spanish_latin_america_or_spain.pdfIn PDF document text
    • https://mixusabap.weebly.com/uploads/1/3/4/0/134096097/655855.pdfIn PDF document text
    • https://cdn.sqhk.co/mitugejaxel/ajjtjdU/jetonebavegowafij.pdfIn PDF document text
    • https://jonenatone.weebly.com/uploads/1/3/1/8/131872225/c200296f.pdfIn PDF document text
    • http://national-verifyteam.com/cuales_son_los_sintomas_de_cancer_de_estomago_en_mujeresvwsie.pdfIn PDF document text
    • https://gisidamuxifa.weebly.com/uploads/1/3/0/7/130775495/panezuxapadaju.pdfIn PDF document text
    • https://wesatelifap.weebly.com/uploads/1/3/1/8/131871597/vadagifawok-kekikunepivaw-jubekobexekudo-jojurobibu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pomirunorejuso.epizy.com/47265998069.pdfIn PDF document text
    • http://xevaxujexodo.epizy.com/45733125520.pdfIn PDF document text
    • http://robowogutalopet.epizy.com/seguferevesovaroviwu.pdfIn PDF document text
    • http://dizutobasuxolom.epizy.com/i_love_you_janu_beautiful_song.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_off0000c80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80E 5460 bytes
SHA-256: 08a05a6fbb3c886abf09a5e62f6e2f9354388c3317b8299fbf5f13c5b33271c9
font_01_sfnt_off0000daaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAA 10580 bytes
SHA-256: 8b9312caf5d6deae4047afbb0e5534ec802c15b9c47fcf08bd0c121dd7340109

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