Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d228030bec1def…

MALICIOUS

PDF

122.5 KB Created: 2021-02-18 07:23:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 047b754c872b6fc7da116af4bb0d6cf0 SHA-1: f5d7cc93dd0c43c99fe24cd2bdafde972d6006f7 SHA-256: a1d228030bec1defa1fd888dfc4938fef346aa5f7d51d0d7b1b0948d881116ae
156 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to PDFs, suggesting a link farm or SEO poisoning tactic. The primary URL, https://jottigo.ru/wix?keyword=bell+f12+instruction+manual, is likely used to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and the presence of external links indicate a phishing or malware distribution attempt.

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 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.
  • 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=bell+f12+instruction+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4472506/normal_5fcb5b7fafd67.pdfIn PDF document text
    • https://resawipodejevi.weebly.com/uploads/1/3/0/8/130814711/nevolotafomeza-pumal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369495/normal_5fe5c6f1a0084.pdfIn PDF document text
    • http://numidib.22web.org/aritmetik_geometrik_dizi_forml.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455669/normal_5fdfc69559cfe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/business_plan_example_for_students.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/dijomerebi.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/zowof.pdfIn PDF document text
    • http://wuzuvulas.epizy.com/baradene_summer_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/60352098882.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/acrylic_material_data_sheet.pdfIn PDF document text
    • http://tupaputukexoro.epizy.com/88217096754.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/filmorago_pro_apk_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/49038236810.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/50429776351.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/lagu_waktu_yang_salah.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/59197151238.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CFD 30248 bytes
SHA-256: 6cf4a8b4ed6a7dee8fad02f85eb7ba939eb7f64d0540cc925da5c884fe65d5aa
font_01_sfnt_off00019b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B93 5260 bytes
SHA-256: 329a974cea1a0c6d1696175fda2ceb87c13f8d6786a5c5a418fd5c4988c8c83b
font_02_sfnt_off0001ad65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD65 14508 bytes
SHA-256: 05ded65200a93a5d2b6f57ad5b6d09e1c9f556dd91b941e1e1d6984a1ecef5f0

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