Malicious PDF — malware analysis report

Static analysis result for SHA-256 7394ff8d82801ecd…

MALICIOUS

PDF

72.4 KB Created: 2021-02-09 16:15:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1cdee5a32050823c2f15723ea0684b9e SHA-1: 5a07b70c712f7509860318e3d637d98956b6664a SHA-256: 7394ff8d82801ecdbc35eb4234cf7cbd96b40036904e6e48a74fa08cf4cef13f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?utm_term=aprender+a+leer+y+escribir+pdf PDF link annotation
    • http://onesmall.space/rovaboruxlxbhc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369647/normal_5fd662220ae91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464313/normal_60017427dac82.pdfIn PDF document text
    • http://slampochka.ru/zovifumvabuk.pdfIn PDF document text
    • http://nuveclovet.xyz/marxist_leninist_party_of_canada5tjzc.pdfIn PDF document text
    • http://slimerecipe.org/jaira_burns_ugly_album_download_torenttkxcfb.pdfIn PDF document text
    • http://astrology-personal.online/45843441785ej4mz.pdfIn PDF document text
    • https://paludiwebi.weebly.com/uploads/1/3/4/0/134012690/duzedufenupax.pdfIn PDF document text
    • http://edalovert.xyz/warhammer_40k_bookswtthj.pdfIn PDF document text
    • https://mifugitosa.weebly.com/uploads/1/3/4/6/134631290/7804228.pdfIn PDF document text
    • https://lixavoje.weebly.com/uploads/1/3/0/9/130969842/1554291.pdfIn PDF document text
    • https://mabajiluvepe.weebly.com/uploads/1/3/1/4/131409333/bufesisow_tafixuf_muzebavuk_joxenivi.pdfIn PDF document text
    • https://pubotaxo.weebly.com/uploads/1/3/5/9/135962756/wituximirolare.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473916/normal_5fca053b60d0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366375/normal_601198dbe8786.pdfIn PDF document text
    • https://dazafilitekanib.weebly.com/uploads/1/3/5/9/135977429/1799704.pdfIn PDF document text
    • http://reduslim-italiaoficial.site/solo_leveling_light_novel_free_downloadb4g1y.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/pusolefosex/brothers_in_arms_apk_unlimited_money.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/bahubali_full_movie_filmyzilla.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/radaronuniditiwara.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/sample_of_incident_report_letter_template.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_off0000dcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB5 5380 bytes
SHA-256: 32e4547d799b3bf4e32ed98ad75ce7f695ef9823ba5e9d650f6a63bf62ede124
font_01_sfnt_off0000ef13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF13 11440 bytes
SHA-256: e0b69932ad9cdde5aae4cf31c70f6adb15a9a91b81925af784b46b34807cf862

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