Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ef9033e787da88…

MALICIOUS

PDF

85.5 KB Created: 2021-03-31 17:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e360fc70b88dd88f4b104649d19ab932 SHA-1: d065d76132e1a74599b5bb8e0ba8d253b639edc9 SHA-256: 40ef9033e787da88fcc679c85b18b25daa67694406f3ffe3ac11fec561a4983a
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains numerous external links, likely designed to redirect users to malicious websites for phishing or malware distribution. The presence of embedded URLs further supports this attack pattern. No scripts were extracted, but the overall structure points to a link-farming or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/wix?keyword=anatomia+humana+hombre
    • https://zutomivopisi.weebly.com/uploads/1/3/6/0/136051870/f289224e2d6fd.pdf
    • https://bubosetew.weebly.com/uploads/1/3/4/5/134515161/2222710.pdf
    • https://banepopewux.weebly.com/uploads/1/3/4/2/134234854/suwibokigikegam.pdf
    • https://guxuxexor.weebly.com/uploads/1/3/0/7/130775085/vewekivulepekuvuditi.pdf
    • https://levibaxa.weebly.com/uploads/1/3/1/4/131408620/31a4a94.pdf
    • https://sokarapojuler.weebly.com/uploads/1/3/1/1/131163736/pefasafuvugibexitunu.pdf
    • https://towowiwegopute.weebly.com/uploads/1/3/4/0/134019464/3eed031ef0.pdf
    • http://alex-chekalev.com/consolation_of_philosophy_sparknotestjo1q.pdf
    • https://wirevoge.weebly.com/uploads/1/3/1/8/131856771/fb387a2d0.pdf
    • https://pavemizex.weebly.com/uploads/1/3/1/6/131606984/paxifejam.pdf
    • http://remastacer.com/46299222450fpus.pdf
    • http://albl.ru/what_are_intervention_strategies_in_education99xmp.pdf
    • https://zogazipo.weebly.com/uploads/1/3/2/3/132303407/4611979.pdf
    • https://xunumiselodaz.weebly.com/uploads/1/3/0/7/130775676/004cedf8af1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zasupafevi.rf.gd/essentials_of_veterinary_bacteriology_and_mycology.pdf
    • https://uploads.strikinglycdn.com/files/60744f96-169a-49ba-ba1d-f84b80514b22/bosch_500_series_dishwasher_shpm65z55n_lowes.pdf
    • http://kasesapat.rf.gd/idiopathic_thrombocytopenic_purpura_treatment.pdf
    • http://maboruj.rf.gd/48967907983.pdf
    • https://uploads.strikinglycdn.com/files/5d4eac0c-5e4b-44e9-82ef-e58204778a11/xefogiriwagififidotu.pdf
    • https://uploads.strikinglycdn.com/files/5b13614c-d0cc-4062-953e-d084314f60c3/mekixagum.pdf
    • https://uploads.strikinglycdn.com/files/156e4ff5-986a-49bb-a568-ac4a4078d8e2/vexone.pdf
    • https://uploads.strikinglycdn.com/files/c76c12f0-a55f-40fe-bf79-cbd606062230/hindi_alphabet_worksheets_with_pictures.pdf
    • http://teruwisap.epizy.com/believe_in_you_cimorelli.pdf
    • http://jilovin.epizy.com/mibezixipopudujilekopajig.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010db8.bin
b71000486206e11385e338c20066a70c457b4f1898b230ca143dcb998f948b4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB8 4844 bytes
font_01_sfnt_off00011e04.bin
ff87e317ef200b5ba02761300b3a1a56136d56cbaa92d4ec3344b3af14451488		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E04 12664 bytes

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