Malicious PDF — malware analysis report

Static analysis result for SHA-256 a215abf2c8e129b3…

MALICIOUS

PDF

80.8 KB Created: 2021-01-10 22:41:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 34f251ac36b8e231d97bd9ca0b2bcd0a SHA-1: 942d0a3de1915032f3f9df78c0c45ee9ed92d759 SHA-256: a215abf2c8e129b305f1f6b4beadfc028b557b32a152b05506263d01c09523fc
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting services, suggesting a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/123?utm_term=trusts+apush+period+6 PDF link annotation
    • https://rofofomigedug.weebly.com/uploads/1/3/4/4/134486696/watatogamep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460981/normal_5fad36396edf2.pdfIn PDF document text
    • https://kojaresojew.weebly.com/uploads/1/3/4/3/134312518/424640.pdfIn PDF document text
    • https://site-1175781.mozfiles.com/files/1175781/rawenalukuzebadepikatipor.pdfIn PDF document text
    • https://site-1168175.mozfiles.com/files/1168175/72957112416.pdfIn PDF document text
    • https://site-1178201.mozfiles.com/files/1178201/fufebupewufifirek.pdfIn PDF document text
    • https://toroborelap.weebly.com/uploads/1/3/4/8/134867907/zepalobak.pdfIn PDF document text
    • https://mosatidopo.weebly.com/uploads/1/3/4/7/134731439/libisanatin-vibimowepixezo-tolibupu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445116/normal_5faa7d6157be7.pdfIn PDF document text
    • https://site-1167963.mozfiles.com/files/1167963/gufosugerorotozavi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406809/normal_5fe150f161d8e.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/fibesezati/44504993906.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03A 6872 bytes
SHA-256: 83c0ebbff9bb991cc93af282d813e07eff3498bf04ff53b0f9d0884f90a25908
font_01_sfnt_off0000f190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF190 5116 bytes
SHA-256: dd68130260c62b0fedc363b1b987a476effc5e33d6514437ef2b48e20c60f1c0
font_02_sfnt_off000102e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E7 2684 bytes
SHA-256: e217788e00231d22f878a75e46743dc4f19e2e04d5e4c845cb7ce9b7932edc5c
font_03_sfnt_off00010edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDB 12612 bytes
SHA-256: 8e1e8ffff362f248757c535af58da94fabfa47f2b75288ae5bd4fb7319045e12

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