Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cc452fd632ae078…

MALICIOUS

PDF

76.0 KB Created: 2021-02-22 17:19:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0fb8a04f79ca8767ecb33acedb465110 SHA-1: abb03c2b71de373e24915c0523e5ee0af17e31d8 SHA-256: 3cc452fd632ae0788c3a4089a55716857fa8e88de36df57f26d3ea1c95fcc7ad
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various PDF documents. One of the primary URLs, 'https://maypoin.ru/wix?keyword=chapter+15+review+answers', appears to be a lure for a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malicious content through the linked PDFs.

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://maypoin.ru/wix?keyword=chapter+15+review+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413702/normal_600394babbb73.pdfIn PDF document text
    • https://gadudomarun.weebly.com/uploads/1/3/4/7/134705140/tixefuzuzeripalub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447253/normal_5ff93ac5d9ca0.pdfIn PDF document text
    • https://cdn.sqhk.co/fifotadog/cJge8wS/turbo_kit_for_2018_toyota_camry.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464710/normal_6002f1b21fbfd.pdfIn PDF document text
    • https://bafuvigugasud.weebly.com/uploads/1/3/5/3/135308410/nuzejanoxarero-rupopopifaravow.pdfIn PDF document text
    • https://cdn.sqhk.co/zururodi/digCvrW/79239429300.pdfIn PDF document text
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/960650.pdfIn PDF document text
    • https://pabaxovazat.weebly.com/uploads/1/3/4/3/134323574/1946533.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446151/normal_602d64c6a0417.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gizonukorad/future_perfect_continuous_exercises_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/dueling_banjos_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/wazogapezodeles.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/what_is_quality_management_plan_in_construction.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/cpc_certification_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/72502950039.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/hulk_meme_template_taco.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/american_arbitration_association_um_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/balanced_body_reformer_wheels.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_off0000e0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F1 4904 bytes
SHA-256: 50bb2c06ab366008530398a167fae4f25ebb3d8ad6e941c7954e3e36c6640bdc
font_01_sfnt_off0000f1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B0 10344 bytes
SHA-256: ce27eca38ff76faa7918653268b32d871864b94e229c0b540188229278e34579
font_02_sfnt_off000114d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D5 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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