Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da33037d0ce1491…

MALICIOUS

PDF

73.6 KB Created: 2021-04-06 17:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: cf944d30a4ce402e14a36f91f6ab2486 SHA-1: 4ea0e49be3e5a4d930e05ac65916a8fa33403c61 SHA-256: 4da33037d0ce1491666a55b915feed3a6935d2d77bc3a8c86b666ac2bcdbbe43
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to drive traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/wix?keyword=block+fortress+war+mod+apk PDF link annotation
    • https://putofikanavo.weebly.com/uploads/1/3/0/7/130738484/liwevujo-kepofirejiru-jegib-reboneb.pdfIn PDF document text
    • http://dagomakiluje.iblogger.org/84780367674.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423136/normal_606b85b29811c.pdfIn PDF document text
    • https://bazifimu.weebly.com/uploads/1/3/4/6/134661545/sobeguwax-rugogafaw-dosim.pdfIn PDF document text
    • https://bixaguvukimub.weebly.com/uploads/1/3/1/8/131872105/nusiji.pdfIn PDF document text
    • https://jadegivi.weebly.com/uploads/1/3/4/8/134851053/3d8ab7c78ed.pdfIn PDF document text
    • https://vixagukire.weebly.com/uploads/1/3/4/3/134364056/julirijedisopezik.pdfIn PDF document text
    • https://jigukijovumide.weebly.com/uploads/1/3/0/7/130740363/fumovaj-zoramorekunad-muworafow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470412/normal_5fe8e54db87c1.pdfIn PDF document text
    • https://ludugekokokak.weebly.com/uploads/1/3/5/3/135313409/kogadejemomopod-lodabadad.pdfIn PDF document text
    • https://kajugomurabamuj.weebly.com/uploads/1/3/0/8/130814292/kojusaxudab.pdfIn PDF document text
    • https://jowamevo.weebly.com/uploads/1/3/4/5/134511132/vakibajen-vefitowolafew.pdfIn PDF document text
    • https://kebomekol.weebly.com/uploads/1/3/5/3/135349545/00376b4ec.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sewadereweben.epizy.com/gesilatizi.pdfIn PDF document text
    • http://jojanotesejivi.epizy.com/trace_reporting_mortgage_backed_securities.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/46559226969.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/cascading_style_sheets_templates.pdfIn PDF document text
    • http://tevufojetuxovud.rf.gd/27996889516.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/instagram_stories_apk.pdfIn PDF document text
    • http://vofogidazok.epizy.com/black_hole_sun_guitar_tab.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_off0000e52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52D 5504 bytes
SHA-256: 210ec070d1e8ced57732fb295486ca615e92c09c3a9bc6e47a5bb0268e755f22
font_01_sfnt_off0000f7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EE 9816 bytes
SHA-256: 7743308f85722f43d27188bbd59804db037186379dbb25a35319fec905706e1b

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