Malicious PDF — malware analysis report

Static analysis result for SHA-256 38d88fe705a31f84…

MALICIOUS

PDF

69.7 KB Created: 2021-03-19 19:40:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d81b687c5eb5b830f19b58531583f243 SHA-1: 446eb9c7208ea263ae0e55bd2513500dd053ce95 SHA-256: 38d88fe705a31f8448bffc5a000ecb65f012c699c6462193d57a063168a9f602
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the presence of numerous suspicious URLs points towards a likely attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/aws?utm_term=what+to+do+if+your+dishwasher+isn%2527t+draining PDF link annotation
    • http://austritkfa.com/nokapesugatox81cxx.pdfIn PDF document text
    • http://russianpatentexpert.com/34221230099tp7pi.pdfIn PDF document text
    • http://opensalle.xyz/sulenjyvok.pdfIn PDF document text
    • http://natiral.space/73017654034689hd.pdfIn PDF document text
    • http://euroshopmn.space/juwomiwexinemvh0y3.pdfIn PDF document text
    • http://rezotu.xyz/8284974567oadpl.pdfIn PDF document text
    • https://bunepefetupudir.weebly.com/uploads/1/3/2/7/132741430/e4690352dcff52.pdfIn PDF document text
    • https://feminudusur.weebly.com/uploads/1/3/1/4/131407357/jitumulod.pdfIn PDF document text
    • http://prodson.space/delta_11-990_keyless_chuckexji3.pdfIn PDF document text
    • http://dombitarf.ru/think_social_psychology_2012_editionc1sp9.pdfIn PDF document text
    • http://teren.fun/49937213548k2igf.pdfIn PDF document text
    • http://gamedv.design/79094881379vsfc0.pdfIn PDF document text
    • https://gokejubekilebu.weebly.com/uploads/1/3/4/3/134376129/c7dc7f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_f637bf8339bc4aebb65f5b049a2d42ef.pdf?index=trueIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_e8a5b36ef5e94ed896dc6af691f38717.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bca4266f-caee-4c82-ab9e-2af80cb22b3d/94492860819.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/ascribe_greatness_chords.pdfIn PDF document text
    • https://c827806f-f9bf-4fd3-a4ce-e487c020fa79.filesusr.com/ugd/6fd45c_fd9a9d1877904941bd72e70613b44b27.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/firudegix/bolegaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee9f047c-ae9d-42ab-8edd-d12bf4cbfa75/25050852257.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/sadabisaponoxa.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/d_d_5e_feats_guide.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_off0000d3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FB 5380 bytes
SHA-256: 9f6f604688ce53b1e337381795acee6fc92c91110d5d0140c58c11707c77a16a
font_01_sfnt_off0000e66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66A 10068 bytes
SHA-256: 18e7bb510ba49bad10eeacdbf439060fe429b79e84c5b23357c34b2db656ff15

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