Malicious PDF — malware analysis report

Static analysis result for SHA-256 36c7d3d66ff7c876…

MALICIOUS

PDF

80.1 KB Created: 2021-03-11 09:47:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e30c9751a174d3f0c2baa69d2e9cbb2c SHA-1: e8b00c757aa9c3ece92a28b0c33386a68010eeb9 SHA-256: 36c7d3d66ff7c8766d8329fe24bd319766fe88ec32a50bcc1953df751d9c0390
186 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, including one that appears to be a phishing lure related to car battery lights. The ClamAV detection and ML classifier strongly indicate maliciousness, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • 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-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://xezojetit.ru/strik?utm_term=what+causes+a+battery+light+to+stay+on
    • https://kinifuromokemo.weebly.com/uploads/1/3/5/3/135348191/3802003.pdf
    • http://xteenware.online/cheap_baby_g_watches_australiagg4jp.pdf
    • http://marketitaly.info/85418994963kgng4.pdf
    • http://vanlit.ru/how_to_find_work_as_a_freelance_writer061lo.pdf
    • https://jidugurulepapol.weebly.com/uploads/1/3/4/3/134310086/sunibisumaxusap.pdf
    • https://gefizubumob.weebly.com/uploads/1/3/4/4/134473977/4606690.pdf
    • http://mafeniwaparidip.22web.org/41869825214.pdf
    • https://doleroxewaforud.weebly.com/uploads/1/3/4/3/134322791/5195368.pdf
    • https://vogaxuruxav.weebly.com/uploads/1/3/4/3/134352923/pimazokugema.pdf
    • http://wdd13.ru/241214035939eqhy.pdf
    • https://gidiwukos.weebly.com/uploads/1/3/1/3/131381706/7117537.pdf
    • https://rirejanumaxix.weebly.com/uploads/1/3/4/6/134631236/2732095.pdf
    • http://discount50.pro/1254661407yejit.pdf
    • https://jirakeleda.weebly.com/uploads/1/3/5/9/135992973/6270526.pdf
    • https://pazisurezufil.weebly.com/uploads/1/3/4/5/134594691/lotetedonuwugubo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_6e1007124e3f49439200a36790fe6fc8.pdf?index=true
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_b7b44ced160143cd95e6ceff0c7c5236.pdf?index=true
    • https://s3.amazonaws.com/zinudipir/wiravigelawadosomowasade.pdf
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_fc9ce414b9174c0c839bb011ecb4e557.pdf?index=true
    • https://s3.amazonaws.com/tirimofufemukat/52360823592.pdf
    • https://s3.amazonaws.com/xesigeze/23561693734.pdf
    • http://fojodopid.rf.gd/7760503676.pdf
    • http://matewodupenes.epizy.com/golezuzasagifatapasi.pdf
    • http://demuremapinob.epizy.com/xusida.pdf
    • https://s3.amazonaws.com/gixawetopoli/nezuzulukasuvokoziduka.pdf
    • https://4ef57e19-9a2e-4e6f-a444-f6b59f982a39.filesusr.com/ugd/4c1554_4278a6e946ed477e946a5d6cdac8182b.pdf?index=true
    • http://rirukezuruxemuk.epizy.com/various_synonym_formal.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f02b.bin
18c87824954bc563281c81b8c9873fa54f2eb05409abc3418899bc68f7368c53
pdf-font-stream PDF embedded font (sfnt) at offset 0xF02B 5200 bytes
font_01_sfnt_off000101dc.bin
cc1ec6c1c4628beef4ab69461cfae7bbd425060c2e6aa8c02dd15e7840c5c9c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x101DC 10132 bytes
font_02_sfnt_off00012471.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x12471 4324 bytes