Malicious PDF — malware analysis report

Static analysis result for SHA-256 55baef9e2aeb90d6…

MALICIOUS

PDF

61.1 KB Created: 2020-11-13 07:17:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 4fd245bab103662df6cf611d73c2d099 SHA-1: 53fc5a928f0adfacd8d5d632b9e046e7b27f02a7 SHA-256: 55baef9e2aeb90d61cc3a53966b6d2c9b65c51394e0efe5e0fdfadf32a17caf5
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 0.9997

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://traffking.ru/123?utm_term=phrases+clauses+and+sentences+worksheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407813/normal_5f93d47332eb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424662/normal_5fa4e4a11a762.pdfIn PDF document text
    • https://zenefuzivoxog.weebly.com/uploads/1/3/4/1/134108933/8237673.pdfIn PDF document text
    • https://gowokijisamupu.weebly.com/uploads/1/3/4/4/134438950/5027188.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393018/normal_5fa28925ece5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370985/normal_5f9898fa98d5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408864/normal_5f9d970671b11.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/felasorarabipis/bivamofovazaxid.pdfIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/amortization_schedule_calculator.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/kopijapagebejoradelowe.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/59941538786.pdfIn PDF document text
    • https://s3.amazonaws.com/vopadofugon/74271415606.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/temperate_deserts_location.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/2007_hummer_h3_manual_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55d91787-726e-4b85-af20-d2e641b5fc9e/formal_operations_ap_psychology.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_off0000b2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AC 5400 bytes
SHA-256: bd7c8fad32e0bf61e173ca907bbc7b36530e8edcac5b888c8ca241f633c84969
font_01_sfnt_off0000c514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC514 10048 bytes
SHA-256: 14afaa5eb931a44a045cf5f63ed07000c136969f3beec77c3ff0c31df68f16e8

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