Malicious PDF — malware analysis report

Static analysis result for SHA-256 35cb344d58570022…

MALICIOUS

PDF

79.9 KB Created: 2021-03-11 14:08:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0374db25a841c75db0b97adcec562186 SHA-1: 3d1dd615986773733c2774dcb6c25ff8e896b280 SHA-256: 35cb344d58570022aff31248cc8b5eb8f3f09d699f53b7ec8b741b5cea3238db
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets and Weebly-hosted PDFs, indicative of a link farm designed to improve SEO or distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/wb?keyword=mind%20control%20delete%20ending%20explained PDF link annotation
    • https://simefaburiso.weebly.com/uploads/1/3/0/8/130814859/jaravuboko-lesozi-verezowinonod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451374/normal_5fe7076450d81.pdfIn PDF document text
    • https://nemerode.weebly.com/uploads/1/3/0/7/130775229/87d023ebca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415309/normal_6000c4189e419.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377388/normal_60498ec33fc47.pdfIn PDF document text
    • http://mamontov-net.cc/35830371499c5nvv.pdfIn PDF document text
    • http://checkmycredit.info/best_self_tanner_spray_drugstore799fh.pdfIn PDF document text
    • https://sobomimaseneke.weebly.com/uploads/1/3/1/3/131379860/61c611d39f3df5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416675/normal_5fd9cb92a7545.pdfIn PDF document text
    • http://nibelv.xyz/491995651710rzfm.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/gonafoziguwewe/barif.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/apprendre__dessiner_manga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/272d8c97-f205-4e20-9952-b00b18511c0a/95820158384.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/imf_latest_report_on_liberia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/415cfcf7-524e-4796-965f-5987ef95fd90/mivezoziwowemab.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/consumer_reports_best_air_fryer_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/high_school_volleyball_score_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f6f3125-c11e-4fbc-957d-ca65832d5201/audi_s4_avant_2020_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/53435305865.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/health_canada_adverse_event_reporting_clinical_trials.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/30135581540.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60C 5136 bytes
SHA-256: f3b7d72af32f81ae0609229d5fb9e9faf339e26656c8fc36445213f9e2e4760e
font_01_sfnt_off0000f7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A6 10700 bytes
SHA-256: cd8f7ac36411387b037f6043e58c621a37eeaa6d8793e0eb40b4cbb40c6d0818
font_02_sfnt_off00011c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C67 16284 bytes
SHA-256: d4179d4d238f994aecba9e96a0bf2522fdc3342286ef37af10cfbbafa5fd03c0

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