Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dcadfb16e45b6c9…

MALICIOUS

PDF

78.4 KB Created: 2021-02-15 07:36:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a07959c6063312ebba5b3960bfed20aa SHA-1: b31f5bd7fd172f08c1a471f56ad04f1d73c9acda SHA-256: 4dcadfb16e45b6c9f45c108a62c9af5285d9ccc1523e6c766ca044bc66f00525
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The document body, though heavily obfuscated, contains text related to "algebra 1 test 4 answers", suggesting a lure to attract users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for distributing further malware or phishing content.

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://baarspo.ru/wix?keyword=algebra+1+test+4+answers PDF link annotation
    • http://english-10.site/feveleroxariri9dlju.pdfIn PDF document text
    • http://sun-italy.space/fotupojog8qyjs.pdfIn PDF document text
    • http://idealica-uficiale.website/988786386206nxt0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382949/normal_60177a217ff3c.pdfIn PDF document text
    • http://cozyplacefor.rest/68255259637s0j0a.pdfIn PDF document text
    • https://vesixogis.weebly.com/uploads/1/3/4/8/134863987/1598731.pdfIn PDF document text
    • http://wiinorama.space/872976728747au0v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379359/normal_5fedabead8e64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469378/normal_5fe8677a879dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487381/normal_601f29451e28f.pdfIn PDF document text
    • https://degezumibupupek.weebly.com/uploads/1/3/4/8/134862322/kujedakugewetosa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489244/normal_6014cc8ae8b59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413693/normal_6029df9b1d719.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486772/normal_60149f04aa592.pdfIn PDF document text
    • https://kavekoda.weebly.com/uploads/1/3/5/3/135326791/wuviluzigomewe-kaxokewixovu-jitabuked-pazegaxuvilop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369182/normal_60001a4012eaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459164/normal_6011d9f31def3.pdfIn PDF document text
    • https://sitimewodojex.weebly.com/uploads/1/3/1/8/131856527/rupafikegowagorebusi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C1 4844 bytes
SHA-256: 3bce0b82947ef430ff14396f2b37d0e5be139b985f7f13b0ac943262774d083c
font_01_sfnt_off0000f954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF954 10736 bytes
SHA-256: 2169ac33110073d6354fde5b74ec19b43820b2d00deb3bf248efbc93da9e2a1a
font_02_sfnt_off00011e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0E 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

Open this report in the interactive analyzer, or submit your own file for analysis.