Malicious PDF — malware analysis report

Static analysis result for SHA-256 a32e371b8e54bcbe…

MALICIOUS

PDF

70.2 KB Created: 2021-03-15 23:01:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b0da5cfe73f966199429da0f0a5578e3 SHA-1: 0f4520216ba384f500d9d23c8fbb047ebffd008a SHA-256: a32e371b8e54bcbe3ee6b546ce7bfa166a44e911897b7ff1a9b51a09eb11da6a
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/wix?keyword=gay-lussac%2527s+law+worksheet+with+answers+answer+key PDF link annotation
    • http://gubixazolela.sportsontheweb.net/trustworthiness_in_qualitative_research.pdfIn PDF document text
    • https://xoverepidagagit.weebly.com/uploads/1/3/4/4/134469055/8765800.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/48159091961.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/tewutepisulubawib.pdfIn PDF document text
    • https://jigupeditu.weebly.com/uploads/1/3/1/3/131380623/xesave_gisuzisufesufi_dopidinosol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_2761292b65224e2b9253d8313217caed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/gibepafukikepezojuzu.pdfIn PDF document text
    • https://aca56392-15ae-48e8-982c-fdf6c4ac0dc3.filesusr.com/ugd/00c070_9e7fc286292047ac9c18f022d245c269.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juvosi/ash_vte_guidelines_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/sowaxozujifaperapisevedo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/361b9e56-55a0-40c7-9d67-b5a3efa2a630/fedibov.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/nuxotanakigesuputa.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/film_minions_2015_sub_indonesia.pdfIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_7d757f3feb2843c2a32aed31c5f6635c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/why_is_my_samsung_electric_dryer_not_getting_hot.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/automobile_parts_description.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/xowibezolopudarufexikip.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/evoluo_das_angiospermas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3712dd20-4b15-4d3b-b5c8-f1a670dc8169/36565208773.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_off0000d3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E8 5240 bytes
SHA-256: 558854ce1f7ecc6d1f978ceff679cab846bac948f367c9d3a8e384741156e3a5
font_01_sfnt_off0000e5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DE 10832 bytes
SHA-256: 0103a1303d82c665f9435a1132daaad6a6b4182f094e9fd963e2b6a8366c77cf

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