Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e487cd7a9d796e…

MALICIOUS

PDF

82.8 KB Created: 2021-03-28 19:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d8a7d6a9846d088eb11f73e83e6bfcdf SHA-1: 59c604d658b254aabf2923a2e8a3cc93ff67b86d SHA-256: b4e487cd7a9d796e0710c1ecec274a6b1d4bd484a438083d401afa26cc10a410
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 0.9998

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://golowaki.ru/wix?keyword=oru+kuppai+kathai+movie+online PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408009/normal_5fc798f6d38a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449766/normal_603841991d317.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366388/normal_6055022e47335.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463010/normal_603c7d756fa48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476274/normal_600cb0160a8ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369305/normal_60366d5b96178.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453901/normal_5fc89d3436dfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466166/normal_60462ef18cae2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446781/normal_5ffec1592018a.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/zoxewudunigus/calcific_tendonitis_shoulder_patient_information.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/the_reluctant_fundamentalist_analysis_chapter_1.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/buwesezibugal.pdfIn PDF document text
    • https://a9b7993f-6967-48c1-a2c3-d5bc86fe985f.filesusr.com/ugd/ea2be3_696025e382234525bc7439279814d1ee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb085ecc-55d0-4cd3-bde1-303a8d90516e/sophocles_oedipus_the_king_sparknotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e630a87c-a12d-4d5c-9d4d-16826e39a2cc/mekesixovawaf.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/aged_care_guidelines_nsw.pdfIn PDF document text
    • https://5ccda086-29c7-4024-8a93-689df1f3b89c.filesusr.com/ugd/ed8107_a68ae4feec7a408c807db31273804970.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed27636b-5179-4b13-abd8-375afd246a7e/ama_a_dios_grandemente_miedo_y_ansiedad.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/doxasamikakudapovesavojog.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_off00010645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10645 5032 bytes
SHA-256: 4e84a20cead5d3cc1add17073515602d22e1202116be3064d265a4b7038a0e9b
font_01_sfnt_off00011740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11740 11316 bytes
SHA-256: d7c368534997ded5578020be2250407f3255056eda26fb69f5049a98cd67e320

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