Malicious PDF — malware analysis report

Static analysis result for SHA-256 957d587bec1e2b14…

MALICIOUS

PDF

74.1 KB Created: 2021-01-08 10:11:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: d62b428b770298592c50e7fa5c1c7972 SHA-1: 70cc8dbd1f7fdc8268ee4b6281f2a31cc3fd6042 SHA-256: 957d587bec1e2b14f64da59216d4bf1d0dd976b9c56ecedc8988395bb2e9c8df
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure related to a medical fact sheet, intended to trick users into clicking the malicious link. The presence of numerous external PDF links further suggests a link farm or redirection scheme.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/aws?utm_term=rch+laryngomalacia+fact+sheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4444123/normal_5f9edf434f2f9.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzutuse/iix49oD/snow_trail_groomer.pdfIn PDF document text
    • https://nitiruminaxodax.weebly.com/uploads/1/3/0/7/130738633/32ff583ac1467.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421778/normal_5fc0a305d45c5.pdfIn PDF document text
    • https://cdn.sqhk.co/nugutobudan/gcgeggC/dodge_neon_dirt_track_setup.pdfIn PDF document text
    • https://fewifaki.weebly.com/uploads/1/3/4/5/134578400/35ede.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://s3.amazonaws.com/genedonapubefe/glioblastoma_multiforme_incidence_india.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/phonics_activities_for_older_students.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/android_view_background_color_gradient.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/63850668240.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/meditation_guided_anxiety.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/wutegimukudememopuderu.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_off0000d786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD786 5192 bytes
SHA-256: 547b90fa341498b2bf012642d64c306d719239775fa179f8c86d4bf28a6d7d7d
font_01_sfnt_off0000e906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE906 10652 bytes
SHA-256: 309f02564da905950217473436d3d80ed4d065a62391f50fbc7072025a66295e
font_02_sfnt_off00010d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D62 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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