Malicious PDF — malware analysis report

Static analysis result for SHA-256 c78eb1a366f6355f…

MALICIOUS

PDF

86.5 KB Created: 2021-02-21 13:42:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 03d36e6adffd741b6b41560c9ed29295 SHA-1: 59b862d61e706617622db86ef5952569d31a98b6 SHA-256: c78eb1a366f6355feae26f49d2a16c1dc84f0561b76b72e4aa7e04cf4e1c7fb9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by both ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of external links, many hosted on disposable domains, suggesting it's part of a link farm designed for SEO manipulation or to distribute malicious content. The embedded URL 'https://maypoin.ru/wb?keyword=why%20is%20my%20samsung%20tv%20remote%20not%20working' appears to be a lure, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wb?keyword=why%20is%20my%20samsung%20tv%20remote%20not%20working PDF link annotation
    • https://fatibetoliwan.weebly.com/uploads/1/3/4/7/134731660/kisuwagol-riwivagovatozek-nolanegirab-sudawe.pdfIn PDF document text
    • https://letotanuvimipe.weebly.com/uploads/1/3/4/5/134598603/7776ad0b28bd0f.pdfIn PDF document text
    • https://nirefuriwubava.weebly.com/uploads/1/3/1/6/131637308/safidarefom-vagorabi.pdfIn PDF document text
    • https://xexidizufom.weebly.com/uploads/1/3/4/5/134508107/mobufivufoniwowa.pdfIn PDF document text
    • https://vemisalisak.weebly.com/uploads/1/3/1/4/131437925/xobusobiko_rowapawawof_jinuwibin.pdfIn PDF document text
    • https://tesazosutev.weebly.com/uploads/1/3/4/7/134714215/kurefosukuku-zetof.pdfIn PDF document text
    • https://zelowomuguzak.weebly.com/uploads/1/3/1/3/131379017/famiwe-rifirap-fedugulurudub.pdfIn PDF document text
    • http://xogumilagu.iblogger.org/12869129537.pdfIn PDF document text
    • https://wumibatolazonik.weebly.com/uploads/1/3/1/4/131437616/vuvaj.pdfIn PDF document text
    • https://koxawikala.weebly.com/uploads/1/3/4/6/134643159/4e6df4b746.pdfIn PDF document text
    • https://jutovadisew.weebly.com/uploads/1/3/4/7/134720627/2341691.pdfIn PDF document text
    • https://puwawegolawibot.weebly.com/uploads/1/3/2/6/132682739/selit-vifunotujolo-lanijebon.pdfIn PDF document text
    • https://cdn.sqhk.co/dutebosatu/VxicicT/zawusobeno.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/cOif4SL/44627335845.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bimitev.epizy.com/jerik.pdfIn PDF document text
    • http://ripivetozevulu.epizy.com/unemployment_rate_in_somalia.pdfIn PDF document text
    • http://rapevuf.epizy.com/suwuzitofu.pdfIn PDF document text
    • http://fulabal.epizy.com/aula_de_ingls_2_bully_android.pdfIn PDF document text
    • http://tawenaxogiminax.epizy.com/cap_full_form_in_admission.pdfIn PDF document text
    • http://lukugebov.rf.gd/gizota.pdfIn PDF document text
    • http://tinuzutajalik.epizy.com/mobile_icon_pack.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_off000114cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CC 5400 bytes
SHA-256: 76929c5875175ebfb6322bc5cfa0f12e4f287df363b1c842fa3e2f7933d37908
font_01_sfnt_off00012721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12721 11172 bytes
SHA-256: 0788ecf63cd241e41c534c8a51073e3134ef5d4119bc3264eadeb0d723bd0661

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