Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a38f8576effd857…

MALICIOUS

PDF

85.1 KB Created: 2021-02-27 21:37:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 561ff9707c52ab7ae1f41243171b5076 SHA-1: 23bc841eb34baf8f57419fdba0577ec21cb213fa SHA-256: 3a38f8576effd857a39599b1586d716fb4d9b6145003f9d96a5f39f64efa774a
166 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including suspicious and invisible links pointing to external domains. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution document. The embedded URLs, such as http://securityofusersdevicesonline.site/15360526735bet6z.pdf, are likely used to redirect users to malicious 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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://pelibifir.ru/aws?utm_term=big+data+analytics+diploma+in+canada PDF link annotation
    • http://kidepokapila.22web.org/kifipimoritebebasewisi.pdfIn PDF document text
    • http://changely.club/define_legal_nonconformityxl6bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460233/normal_5fed73c97a900.pdfIn PDF document text
    • http://lnstagramlivesupportcenter.com/9356223585696c7y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367019/normal_5ff0ea16845ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446166/normal_5ff76ecd295fd.pdfIn PDF document text
    • http://securityofusersdevicesonline.site/15360526735bet6z.pdfIn PDF document text
    • http://medway24.com/31743793874id9f5.pdfIn PDF document text
    • http://laxetatisitu.iblogger.org/gazulofujorasagomi.pdfIn PDF document text
    • http://scrlt.xyz/57170953902oz27w.pdfIn PDF document text
    • http://zoosalon.org/duvoguwinasiletuvuzi94tjt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wekumut.epizy.com/veritext_reporting_locations.pdfIn PDF document text
    • http://kubalomarupageb.epizy.com/peavey_bandit_112_red_stripe_vs_silver_stripe.pdfIn PDF document text
    • http://gimezevu.epizy.com/81251712489.pdfIn PDF document text
    • http://wujitotulofok.rf.gd/38755358680.pdfIn PDF document text
    • http://sudimomovaw.epizy.com/rogetotulikoloxim.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_off00010f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F54 5448 bytes
SHA-256: 84521b2d5e03bea396d3ea4e4038be14b0eb28d78fa536e0a9a522355f5c5768
font_01_sfnt_off000121dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DC 10984 bytes
SHA-256: ba724ff4755885d6cb0c761b0e3a3d0c92b69bfba782c91179931c0ee1c41782

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