Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c8401ed4787d410…

MALICIOUS

PDF

42.9 KB Created: 2020-11-05 21:58:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e33a3d6a61ca8186f4290a2bd73aadd2 SHA-1: dda2ff0ebef1e0bc6d942047af33f07153d8025c SHA-256: 9c8401ed4787d41076042f215e4476e4cf1ab015d46e281e3970cacbb036ccde
104 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 an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffking.ru/strik?keyword=mascoma+school+district+nh PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379034/normal_5f8a319d7fe4c.pdfIn PDF document text
    • https://vebifejelib.weebly.com/uploads/1/3/0/7/130775119/tudazanumabawag_gevaso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387918/normal_5f9f294a7c629.pdfIn PDF document text
    • https://pitimonajavigo.weebly.com/uploads/1/3/1/3/131383860/jineverolud-pefekalib-vidusufela.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387577/normal_5f97bf551cf06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375908/normal_5f90d9ddc8dbd.pdfIn PDF document text
    • https://parudebizaju.weebly.com/uploads/1/3/4/0/134096066/3528876.pdfIn PDF document text
    • https://ximazula.weebly.com/uploads/1/3/0/7/130738777/9407591.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402722/normal_5fa32db9c4c2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368244/normal_5f883f40b7eef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zetare/salesforce_interview_questions_and_answers_for_freshers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a381a52c-589a-45f5-81fe-1f52c803cfb3/ribebizok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ef0dec5-06aa-46a9-b0e0-13debea35249/xebex_air_bike_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d322050-b6b1-41e7-b573-db4ebecc03ab/kabik.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/elementary_number_theory_strayer.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68DB 5184 bytes
SHA-256: f7fd6854530e5aa2c10c0e30a0799b27fc99d8b3ac506ff591156df0288d266c
font_01_sfnt_off00007a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A58 10792 bytes
SHA-256: a8f607a7c42e52ee529faf957c8cecaa7f667ddf06367c477085d0dd53cde8f8

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