Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a18389e0f8fd36b…

MALICIOUS

PDF

80.3 KB Created: 2021-03-31 06:40:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9418c830e8a1d40257079add72a6afb1 SHA-1: 1999badc2755f4d7ab5ba25f4dc480cc3f63f17c SHA-256: 8a18389e0f8fd36b43dc245667bcd49cc6e5f2102155648531a973b91f9c77b2
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 0.9994

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://fokemale.ru/award?keyword=hbr+strategic+thinking+pdf PDF link annotation
    • https://cdn.sqhk.co/badiboxa/iXvEgj7/mukejuzizitoximomawajap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394077/normal_5fdf6da560fab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491687/normal_5fcf698d858d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479470/normal_5fccf4c19c9c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443610/normal_6007b081d5b53.pdfIn PDF document text
    • https://cdn.sqhk.co/xonipavu/ij8icJi/gesor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453741/normal_602a812ba732d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368230/normal_60003b881ad43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370057/normal_5fd09f3be8792.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495251/normal_5fe2dde20cff0.pdfIn PDF document text
    • https://cdn.sqhk.co/zuzipogowita/hiFxDhj/69966866952.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_f192642e64bb4a0bb1c0f79de7939847.pdf?index=trueIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_293aace35e834838b40cdedae19b7fd6.pdf?index=trueIn PDF document text
    • https://e18e6c05-101e-4f41-9c4d-f518aea09dbb.filesusr.com/ugd/7972b3_da067ab0722249a489435279c1a2bab0.pdf?index=trueIn PDF document text
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_d388935ad56247d880ee538b57b43f33.pdf?index=trueIn PDF document text
    • https://2e21b658-2967-4279-8f18-a03590b678a5.filesusr.com/ugd/f5e1b2_f79733807e2b47638359d9fd87ca0377.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5220219a-e1f1-45a8-998f-491590dc84bc/fallout_4_companion_perk_without_romance.pdfIn PDF document text
    • https://cb47f074-0476-4434-b381-5672a365cab8.filesusr.com/ugd/c46c8a_f89f9ac2879e440b9b3b285060b40a3e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ae50bb8-a840-474a-9e7e-620cefe7f809/what_are_the_instruments_for_qualitative_data_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3fdcde6-6abc-4dac-a0fc-6b32b83be16b/bukagikadumamo.pdfIn PDF document text
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_42673465099e4062b34eb31ce4bfc2c9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5921719d-0034-4121-a763-12c9ff29af2d/4373439975.pdfIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_9a8e735d66d14e4ca7bec5021e3710e1.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_off0000fb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB72 5548 bytes
SHA-256: 7146520c2b1cb8b4d7d99be85b06c5bf91c791f473435542d3b16974120a9a5a
font_01_sfnt_off00010e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E46 10612 bytes
SHA-256: 7a5cd7e6bc738f459081a490f1ec34634df3bcad819617aaadb2a256ac159b5d

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