Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c5498b9e9346c3…

MALICIOUS

PDF

80.2 KB Created: 2021-02-23 21:17:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 0015535628e6559a9f63052b7e9884f9 SHA-1: 64b7fd318c537b9dbfbd279789456470b6010c3e SHA-256: e8c5498b9e9346c3f1f054958ee2a3b8ac492f929a02f79af90a830d9e824bf5
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior, indicating the document's purpose is to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jottigo.ru/wix?keyword=scientific+method+review+crossword+answers+key PDF link annotation
    • https://zofumevovuve.weebly.com/uploads/1/3/0/8/130874077/juxakekipelipuwuvir.pdfIn PDF document text
    • https://jawejeletisib.weebly.com/uploads/1/3/4/8/134886371/0ee03.pdfIn PDF document text
    • http://zesijesagevonot.22web.org/mekisefolukobuzobaxirux.pdfIn PDF document text
    • http://rilizikurejoru.22web.org/97526771476.pdfIn PDF document text
    • http://dasuwupozu.22web.org/26808597669.pdfIn PDF document text
    • https://dolunejasuvufa.weebly.com/uploads/1/3/0/7/130776008/totagab.pdfIn PDF document text
    • https://vawuzusafut.weebly.com/uploads/1/3/4/8/134863851/jututodas.pdfIn PDF document text
    • https://cdn.sqhk.co/kitaparek/1giPif9/bubijovezafizowofugejago.pdfIn PDF document text
    • https://cdn.sqhk.co/rojozedofaf/jgiyMgj/fogububunofalabiwoj.pdfIn PDF document text
    • https://cdn.sqhk.co/pesegozod/zjiWPZb/mike_tyson_record.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wurekino.epizy.com/xumarawal.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/dekifoduwegozexajal.pdfIn PDF document text
    • http://zutadelunixirot.epizy.com/nice_guidelines_2019_asthma.pdfIn PDF document text
    • http://jopiliseduvorop.rf.gd/tagurizimevulum.pdfIn PDF document text
    • http://vujoponax.epizy.com/gevarasofedigisiw.pdfIn PDF document text
    • http://roruvavaderej.epizy.com/apil_guide_to_personal_injury_claims_procedure.pdfIn PDF document text
    • http://putazosaw.epizy.com/82004157347.pdfIn PDF document text
    • http://maladovefo.rf.gd/gipumijavekuvolopafugupa.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
    • http://sinhala.sourceforge.net/In PDF document text
    • http://sinhala.cvs.sourceforge.net/viewvc/*checkout*/sinhala/sinhala/fonts/CREDITSIn PDF document text
    • http://www.gnu.org/licenses/gpl-2.0.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAF 5652 bytes
SHA-256: 5b424fc0197d2e2ebe4ddb5a271529e5b021da6a2c29ceb85911395d9e24e8e3
font_01_sfnt_off0000ff97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF97 4652 bytes
SHA-256: 9ebe5236eec3bd9a5dff51d526b367c8e5958cbe4f0ed96a936c2fe23d1c53c8
font_02_sfnt_off00011014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11014 10248 bytes
SHA-256: c9340f8feddf5603279d8c673685e8f5b61349b0020d9cca6ee1c8c6b6f153ce

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