Malicious PDF — malware analysis report

Static analysis result for SHA-256 0848118fddacafdc…

MALICIOUS

PDF

76.3 KB Created: 2021-02-27 10:39:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b2edd7924c9fcd87196eceede7fc591a SHA-1: e52741169574145cdd19f05440c1e7a050d02028 SHA-256: 0848118fddacafdcb54e9f4a83df0037ac516ccad2da5886ce3deb515b040970
186 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by both a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, containing numerous external URLs, many hosted on disposable domains or using UTM parameters, suggesting a phishing or SEO manipulation scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

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://jacksth.ru/123?utm_term=logitech+z5500+sub+size PDF link annotation
    • https://bekogome.weebly.com/uploads/1/3/1/4/131454098/5616889.pdfIn PDF document text
    • http://tiwilofojifig.sportsontheweb.net/78867775488.pdfIn PDF document text
    • https://sadixudodexoz.weebly.com/uploads/1/3/4/2/134234615/juxaka.pdfIn PDF document text
    • https://nofixemi.weebly.com/uploads/1/3/6/0/136082439/2058207.pdfIn PDF document text
    • https://katalajoguv.weebly.com/uploads/1/3/2/7/132740778/7931490.pdfIn PDF document text
    • https://sujofunipus.weebly.com/uploads/1/3/4/5/134502209/xonosuferebuxej_lipibomuxudigip_dorimenibalan_butosuvu.pdfIn PDF document text
    • http://buyervannakupitvsem.xyz/aadhar_by_enrollment_number1v218.pdfIn PDF document text
    • http://g2am2e.xyz/mobile_chess_game_apkpurejin21.pdfIn PDF document text
    • https://xegafifa.weebly.com/uploads/1/3/0/7/130776616/vefevemubameb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wepaxilex.epizy.com/nitifenaxagakivugem.pdfIn PDF document text
    • http://wipapirub.epizy.com/pudukevonopogorezalesono.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/nifasuxiduzili.pdfIn PDF document text
    • http://dogefifuga.rf.gd/process_flow_template_ppt.pdfIn PDF document text
    • http://vubalek.epizy.com/lineage_2_interlude_hawkeye_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/why_is_my_washing_machine_not_spinning_out.pdfIn PDF document text
    • http://maguzuj.rf.gd/uppercase_cursive_worksheets_free.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_off0000ed92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED92 5120 bytes
SHA-256: e3be57ff8fe3b31d79047e6c930dcfaea64dbb4c4d86171c462da0d43ee77e4f
font_01_sfnt_off0000ff16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF16 10900 bytes
SHA-256: ce2cd9d34602aad1c035e6ec53f89776520e3137c3f3882cb572bb541152e9b5

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