Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b44c49b41d7afed…

MALICIOUS

PDF

70.6 KB Created: 2020-12-19 17:41:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: bbf17ea1e5ed537f2c5db7b63e6d1baa SHA-1: 4ba72f6fd4f8a5a50af48d8c998b84d87cc311be SHA-256: 7b44c49b41d7afedcd043694553855f66a38e121a77eeca35e6778fb9a644770
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a suspicious domain associated with malicious activity. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, a common tactic for distributing malware or facilitating phishing campaigns. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffnew.ru/strik?utm_term=que+te+gusta+hacer+worksheet+capitulo+1a+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402247/normal_5fc1e57da6cfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461509/normal_5faf5e2f494a5.pdfIn PDF document text
    • https://moxudula.weebly.com/uploads/1/3/4/8/134884970/7813451.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408340/normal_5fc1813f25c1a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/25b57985-f327-4d7f-aaa4-4f9c63df5a12/kemojaxugenemugija.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/remember_me_oh_mighty_god_song.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/consumer_reports_electrolux_canister_vacuum.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/lezidimobulero.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/bibodixonodololoriguve.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/romenuno.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D5 5348 bytes
SHA-256: 95532f81f17ec2c78e8d281459e4c8cbe9cef5ae1ab7c41664e657e53dd11853
font_01_sfnt_off0000d519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD519 11960 bytes
SHA-256: ab8f1d340b6e9d71fd0e6ca02eaefc7ec81f9128b2c8db3c3cf2c231a76bd37b
font_02_sfnt_off0000fd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD25 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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