Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f4d7513ffe4e25…

MALICIOUS

PDF

65.7 KB Created: 2021-02-23 17:56:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: bc3c4c07223be864f7dc91b2deba5a81 SHA-1: 6b6b6dc70c957f91323c768fae5145324a2b94c4 SHA-256: 16f4d7513ffe4e25b374aa6eb2ebd68571c09ba858dda4e381e30d7d3e41ed2f
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a PDF link farm containing 30 external links. The ML classifier also assigned a high probability of maliciousness. The primary URL, https://maypoin.ru/123, appears to be part of a campaign to drive traffic to external sites, potentially for SEO manipulation or to serve further malicious content. No scripts were extracted, but the presence of numerous external links suggests a phishing or content-distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=sentry+safe+factory+codes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486983/normal_6022adb712eb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467927/normal_5fe613bac63df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419195/normal_5fd7d702bcbae.pdfIn PDF document text
    • https://pumurepuwalor.weebly.com/uploads/1/3/5/9/135978845/luwikixujudu.pdfIn PDF document text
    • https://nijumaweka.weebly.com/uploads/1/3/1/3/131379182/tulifijefizasologare.pdfIn PDF document text
    • https://nafoxowozuvika.weebly.com/uploads/1/3/1/3/131383754/falitalapuk_pajibos_somajivalawe_xikowipexun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405206/normal_601916cbc74dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447663/normal_5fd9905f38c17.pdfIn PDF document text
    • https://nalufubuxozukex.weebly.com/uploads/1/3/4/4/134479837/zupim_magafixu_xabejibubefaz_merit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454054/normal_5fee8069b0edf.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/putelekireza/welarog.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/whatsapp_video_status_new.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/mabomos.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/lullaby_of_birdland_bb.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/how_to_make_money_online_in_ghana.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/what_qualifications_do_you_need_to_join_the_navy_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/2007_kawasaki_bayou_250_oil_filter.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_off0000c663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC663 5188 bytes
SHA-256: b348dc9dd743e97f4def9bea23dd5e7e3d00ab20abe7c2c0c4e992a4317902b0
font_01_sfnt_off0000d81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81C 9944 bytes
SHA-256: 3f0760eadec0a166dfd59767342e61ceadb4e179756b3f460c171e6ae3642e89

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