Malicious PDF — malware analysis report

Static analysis result for SHA-256 d920b738a6337bc1…

MALICIOUS

PDF

94.5 KB Created: 2021-04-19 14:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a263684e96c0f307e6e7eb1bde136455 SHA-1: 4b33067f62e0c4c29ee35380b9185333ff53e3a5 SHA-256: d920b738a6337bc1967b9487159c646d4589615473c7179e1ab15cd533aaf948
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious lure designed to redirect users to harmful content.

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 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://xezojetit.ru/strik?utm_term=why+does+my+acer+laptop+keep+losing+wifi+connection PDF link annotation
    • http://creampiepow.club/nys_dmv_drivers_abstractcu7bv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458412/normal_60255f34688a2.pdfIn PDF document text
    • http://jnatural.space/63017210113npanl.pdfIn PDF document text
    • http://erogan-encolumbia.site/what_are_the_three_rivers_in_fort_wayne_indianazn1fm.pdfIn PDF document text
    • http://instapriz365.site/what_do_orange_lilies_representyw3gi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500678/normal_5fcae6f47f168.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393779/normal_6013ab08565d8.pdfIn PDF document text
    • http://speak4pro.com/hollister_jeans_fit_guidesvbh9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466413/normal_606c4b3114bff.pdfIn PDF document text
    • http://wei-nmvc.com/freightliner_cascadia_radio_antenna30ozr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502493/normal_60472bade89f1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef0b0b70-f985-4b30-8fe3-ee4d3196fcd4/99645584296.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b674fc3a-f55f-42b4-af22-acd70ace266d/defiant_indoor_24-hour_digital_timer_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/9964125698.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/962ac8cb-1610-49ab-9637-328b3647eb8d/fifty_shades_of_darker_movie_plot.pdfIn PDF document text
    • https://f9c380c0-3c9a-404e-8c76-a924832b335c.filesusr.com/ugd/9c8fb9_2afdd61200594e5ebf43e1c2a80da41a.pdf?index=trueIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_564bfbe16acf4560ab479eb99e90fcf7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gopuze/new_hotstar_app_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/body_temperature_app_for_android.pdfIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_e8684c7569664104933d6661f4911615.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E73 3796 bytes
SHA-256: 7311f627b75dcb1e95609064edaf7edc0930f623d4975111045c7639f2968ab9
font_01_sfnt_off00011c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0E 5840 bytes
SHA-256: 758d3775fa7ac6f5f778956f4967219a3377d66f73abd4b6354b5110e4f2e048
font_02_sfnt_off00012fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEE 11388 bytes
SHA-256: 21757231e08dfa401fc13a14d7f9a16794a8cf3cce8aa7a81e120c72dee11638
font_03_sfnt_off000156f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156F0 16132 bytes
SHA-256: baf0cf72dd19031a44382e018390a459f6f0a0cb7d6ea547220e1e87908ae422