Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f9f3f7ce8793e2…

MALICIOUS

PDF

89.9 KB Created: 2020-11-11 05:49:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 6dcee52e224f185dc1735a89aea610f8 SHA-1: dd10e7352cc562bf8b6e6c2689f327bd4429f3f9 SHA-256: f3f9f3f7ce8793e2f78f586b914d1ad7dae2b0505f0ed1ff80af47f75d463969
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafffe.ru/strik?keyword=linting+c+code PDF link annotation
    • https://pepotoxuxomupav.weebly.com/uploads/1/3/1/4/131483830/sapanufekapuzab-kurozolap-relazamozot-puseput.pdfIn PDF document text
    • https://nikuwexipamojag.weebly.com/uploads/1/3/0/8/130813731/9386871.pdfIn PDF document text
    • https://xikalevu.weebly.com/uploads/1/3/4/3/134319979/megipuniwepozitugapo.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/7331504.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/deae1f21-6396-46ab-9e1e-8a198330cb04/www_ccrd_info.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/britax_roundabout_55_instruction_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/241927f5-1171-452c-8a6a-01ba6dc55c46/freezer_burn_ice_cream_while_pregnant.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/60740803249.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0088ec8c-16c2-4521-b6f6-2c1d651f38e2/zinogavovopulawosidavosi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee5ad7be-4778-4809-ade8-982800f13551/nifoserujonadoxukudebiki.pdfIn PDF document text
    • https://s3.amazonaws.com/texifaxepag/38300681113.pdfIn PDF document text
    • https://s3.amazonaws.com/pedokeza/1249195816.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/acid_base_calculation_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64a648cb-c311-43bc-9ffc-a50d1c669362/genanuxidegifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a326b94-8c15-47bc-85b8-578060daee49/power_of_the_psalms_by_anna_riva_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c63f1ca-c19e-4741-9f25-2d091401c4b0/metodo_kaizen_para_nios.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56E 4532 bytes
SHA-256: ca0fc90b00d438cfc3bcdcfd720052a9a933e7ec27445be853e6c3dba437e696
font_01_sfnt_off000104f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F5 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off00011050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11050 2992 bytes
SHA-256: 89878716a43a0a0a19e649b9760e53f15fae3abfa099477025aff4d8b07344c9
font_03_sfnt_off00011c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4A 11948 bytes
SHA-256: 7407e631fdfa3ae31a44e8830aa3f1e8375daf6d87938547b5ce258555314848
font_04_sfnt_off000144fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144FA 16120 bytes
SHA-256: b7d3fe0f0eed6e60c79e5026c6c3c7babf05c9d359090ed5b12ebb11be5d450a

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