Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d5a500e80af906f…

MALICIOUS

PDF

76.7 KB Created: 2021-03-21 11:03:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: dc5aae23d77743aaa90f521f0e38b7d7 SHA-1: 7f5e3a1205033052f3accec0c589e561e8baa9b6 SHA-256: 9d5a500e80af906f9d8961561ff6ddebd4fdc551630812549158f1b60e208ddb
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized to appear as legitimate documents or software downloads. The presence of a link farm and the ClamAV detection strongly suggest malicious intent, likely to direct users to phishing sites or malware downloads. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://golowaki.ru/award?keyword=download+nitro+pdf+reader+gratis PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4391024/normal_600520c988450.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446264/normal_5fe5c3cc70da9.pdfIn PDF document text
    • https://rulafowobunafo.weebly.com/uploads/1/3/5/3/135391395/5068576.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448984/normal_60089b5bac842.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481275/normal_601988b0a5075.pdfIn PDF document text
    • https://gumiworawogulaf.weebly.com/uploads/1/3/4/3/134356348/pebefavaxani_zepebed_kiwizalagax_sarufusazewutu.pdfIn PDF document text
    • http://relax35.ru/riverside_golf_range_nottinghampmlkt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417314/normal_605491a296c7c.pdfIn PDF document text
    • http://indonesia2health.online/vocabulary_test_online_for_beginnersz4ln6.pdfIn PDF document text
    • https://kubikogemovi.weebly.com/uploads/1/3/4/0/134095998/9908340.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_aef146ba490740aaa9d762ff6a0de72e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/informe_diagnostico_empresarial_ejemplo.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/creative_writing_definition_and_examples.pdfIn PDF document text
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_9ac264ccb5d34634bce8a36a1c6185eb.pdf?index=trueIn PDF document text
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_ee63bd9550434ffea59104614d5a1f34.pdf?index=trueIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_136a2cfa5b3548449899b36e92cd0693.pdf?index=trueIn PDF document text
    • https://71e5fc8e-cc9a-4633-96c3-2c70acd464d0.filesusr.com/ugd/f08e01_5d62337cb94b46479fa4910292e8a16f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/73337535596.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/mhw_charge_blade_guide_arekkz.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/kitadol.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_off0000e9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CC 5300 bytes
SHA-256: e869361e5e95a34f58ecf3af8c50a96cdfd978f2aa1cc964adf6728b69a38581
font_01_sfnt_off0000fbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFD 13092 bytes
SHA-256: bd194597f27a77a12a8604eb47aa2c215871443cb535850bb620106e9cbeac5b

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