Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c72215c502c82a4…

MALICIOUS

PDF

78.6 KB Created: 2021-05-01 02:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 158585d3280d9bedbaaedf0f6266b0d5 SHA-1: 8c0be1fe5fcca65879b27b9abc0f962a0fdc2ba6 SHA-256: 6c72215c502c82a41fc9a619655af0d0bb601eb2715a4bdd98be2d9db19967fe
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, indicating a link farm or SEO spamming operation. One of the extracted URLs, https://jacksth.ru/strik, is directly related to the document's purported topic, suggesting a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=how+to+use+waveform+monitor PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369307/normal_5fd9d8026860b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371787/normal_602ab4dd243c3.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/ti_84_calculator_online_free_no_downloadzsjxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379377/normal_605cab951d23f.pdfIn PDF document text
    • http://keto-menu.online/esl_classroom_management_tips_and_tricks3d6ak.pdfIn PDF document text
    • http://strapslap.online/kusarolejatefusct9v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421943/normal_601c5ccac66f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471683/normal_5ffaa594611bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375339/normal_605269e589699.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/ginutu/gupawawazox.pdfIn PDF document text
    • https://f499a9ea-5579-4d3c-a180-ba191067f9b7.filesusr.com/ugd/34ec99_fc6ab73d64ec4d2cb1966cc153388d78.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/adobe_after_effect_cs6_pc_software.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/how_to_play_code_breaker_board_game.pdfIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_93a20ec52c8e496780ca6a56f5e8bc03.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/central_route_of_persuasion.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/b2b_marketing_plan_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/local_tv_guide_memphis_tn.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_off0000e8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C2 4876 bytes
SHA-256: 36adce54f33bf06cc13867ba97a9c10f3de99885fb3d3fe0cc522824ec096891
font_01_sfnt_off0000f94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94E 11140 bytes
SHA-256: eceeedbecbdc83c2b72a8dd35e86c6cf52661d3cc2d3bac9866879bf4bc4f27b
font_02_sfnt_off00011f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F52 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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