Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51d2ac8537cd807…

MALICIOUS

PDF

99.0 KB Created: 2021-05-08 12:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a85526bd95f3743f1dfbd77acc03aa67 SHA-1: 10f1244fb1ebf1209ca9041b41937b1cad626a71 SHA-256: d51d2ac8537cd807b9c0c07259d680c6a7f448239ac8578ed562fd4d364f46a6
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 pointing to disposable domains, suggesting a link farm designed to manipulate search engine results. The primary URL, 'https://resalured.ru/strik?utm_term=precalculus+with+limits+pdf+answers', is likely a lure to direct users to malicious content or phishing pages. ClamAV and ML classifiers also identified this file as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://resalured.ru/strik?utm_term=precalculus+with+limits+pdf+answers PDF link annotation
    • http://digosige.mywebcommunity.org/welejebu.pdfIn PDF document text
    • http://sozimaxetupow.mywebcommunity.org/microbiology_staining_techniques.pdfIn PDF document text
    • http://lenuvivureropi.scienceontheweb.net/tufuzufagefiwexejikowe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413975/normal_5fdf4c555ba7a.pdfIn PDF document text
    • http://kodavuviguwu.mypressonline.com/nonafawa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486359/normal_60396e3487eb8.pdfIn PDF document text
    • http://vadanunagirira.getenjoyment.net/kpss_tarih_pratik_bilgiler.pdfIn PDF document text
    • http://molufipet.sportsontheweb.net/cadette_robotics_badge_requirements.pdfIn PDF document text
    • http://gukiduwonaxinef.getenjoyment.net/82328816791.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388627/normal_60074897beb6b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_6e2e1d43c2df4e439956e6e32a4b44f4.pdf?index=trueIn PDF document text
    • http://xufoziminep.onlinewebshop.net/59535524204.pdfIn PDF document text
    • https://5e04165b-6ab1-49a6-9937-45006fc2fbeb.filesusr.com/ugd/d19879_417c71b8579c4eed82afe2f6f5703316.pdf?index=trueIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_ee446c4a49c444bea412d343cc202b78.pdf?index=trueIn PDF document text
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_8c8b6e87adf54847a4c4f3a7c7b8736f.pdf?index=trueIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_8a037b1773ee4f0691ad5aa04d9ec2e6.pdf?index=trueIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_d7da47a4ea364342a24856299e762422.pdf?index=trueIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_480fb1243ddd4bf59a9f08963f94d0c1.pdf?index=trueIn PDF document text
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_dafba6ea6a604bb8a255f36fb52a584a.pdf?index=trueIn PDF document text
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_02a7ee0aa0dc482ca92bb93ea1fbc2b5.pdf?index=trueIn PDF document text
    • https://1f2f8e77-98df-4c5e-b88a-83bc2b612b58.filesusr.com/ugd/5c7528_4edad84affcf48fdb4f21b65bb3e07de.pdf?index=trueIn PDF document text
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_30bf89013b7942e7a57d5b9bdea823d2.pdf?index=trueIn PDF document text
    • https://acda325f-ee3b-40e4-882f-fabc489a6840.filesusr.com/ugd/23b3d3_b26b1fded7fe4c239b93e2effa36a03a.pdf?index=trueIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_f131dcf995284bf3a9414f5e0c2cbf05.pdf?index=trueIn PDF document text
    • https://67bb8873-ca08-4da4-87c0-60a8072ebff6.filesusr.com/ugd/a838c0_8825cfd5c09f478ba485dd2a693606e4.pdf?index=trueIn 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_off00014150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14150 5488 bytes
SHA-256: 829f060b94500f852c2df00b634084768b6a382e3200e6d23f284b207202a5f7
font_01_sfnt_off000153df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153DF 12588 bytes
SHA-256: ad4f5f4a1e3d236d2fa1a447bfe10dc249dea6beb283ff35f732feeb180d4828

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