Malicious PDF — malware analysis report

Static analysis result for SHA-256 54042d64e9faf806…

MALICIOUS

PDF

70.8 KB Created: 2021-03-27 16:26:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4e4b6376b382f5bc5748c54e2fe5f456 SHA-1: bd1df4eef74013aa484edc76da2bc938a9471c3f SHA-256: 54042d64e9faf806a2c627eaa1d1fa7a1df50feda64fe130b1e5b58dae83a20d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, one of which is a potential phishing or malware distribution point. The document body, though heavily obfuscated, suggests a lure related to 'author's craft examples'. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jumiwimov.ru/wix?keyword=author%2527s+craft+examples PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379233/normal_6058d8b77a137.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368245/normal_605ee6b62d94d.pdfIn PDF document text
    • https://zugasemoz.weebly.com/uploads/1/3/4/5/134593751/sigexojinotof-debopebaxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466151/normal_5fdad51e8b413.pdfIn PDF document text
    • https://pagopejej.weebly.com/uploads/1/3/5/3/135315805/mikosi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392474/normal_6057d05f48a69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484156/normal_601f23688fe4f.pdfIn PDF document text
    • https://xubejuvanexog.weebly.com/uploads/1/3/5/3/135311054/jikonokifoled.pdfIn PDF document text
    • https://xiwevejuvufevi.weebly.com/uploads/1/3/1/3/131380641/zajikezove-fiwofubewiwek-jilazijoru-palulebaxomima.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://354df738-7a8c-4643-bdcd-aa58f7c4bd0c.filesusr.com/ugd/69cf62_9a5add1c9f684ab0ae8b63440be4fa51.pdf?index=trueIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_4c4341ccf8534e57ad28c5e999cdbbe3.pdf?index=trueIn PDF document text
    • https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_dd367eac9bc54add8d18fbc6d3ac3476.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e38d0e3f-e6fe-487a-9f92-eb93f0c65ab4/basic_symbols_used_in_technical_drawing_ppt.pdfIn PDF document text
    • https://50e0a74f-e7a5-4ac3-a7a6-4cdd7b1ad00e.filesusr.com/ugd/8a9d9f_5a1ce41af6cb4d63833f7951986d0dbe.pdf?index=trueIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_7d1192d39fa5434f806bd3e91878ca87.pdf?index=trueIn PDF document text
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_a4ff8658027640bb88cc0b19c7b984f7.pdf?index=trueIn PDF document text
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_6d9fe1c35a414b918334a95a75af6600.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc24a278-2f8a-4aec-adc6-c8b92ebda522/dokesatewusir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a43430ff-3cf8-4761-97c8-b7fa57ceec2b/stress_concentration_factor_chart.pdfIn PDF document text
    • https://976edc35-935c-46de-9e6e-e225dbc25668.filesusr.com/ugd/0829d8_fce9930a5b574773a6d1afc3ed051abf.pdf?index=trueIn PDF document text
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_6a1c8d9a2fa34b51bec543041f28695f.pdf?index=trueIn 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_off0000d7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F8 5344 bytes
SHA-256: c33766bade5a79ae9e3ce5aa0288da40488dae07946f0fe0cfc8cecd73ce47ac
font_01_sfnt_off0000ea0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0A 10568 bytes
SHA-256: 3efd3bd17a0acc505dad012ce5f47d4e94ef088e2a5b03ed80136c6503fb8cfa

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