Malicious PDF — malware analysis report

Static analysis result for SHA-256 9272504354b49cca…

MALICIOUS

PDF

84.8 KB Created: 2021-04-18 04:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ea6b3ee697dac0cd8c19f1ee7c3a2b71 SHA-1: 23bb120c58f4dfa4d4f69d2baa361e3e60862427 SHA-256: 9272504354b49cca7204a25c95e6198b6a3e51f5c065963ce549b739bd51e5b0
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to disposable hosting or potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing or trojan. While no scripts were explicitly extracted, the structure suggests it's designed to lure users to external sites, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://midufefew.ru/strik?utm_term=after+we+fell+movie+cast+trevor PDF link annotation
    • http://gagimubu.mywebcommunity.org/54321_grounding_exercise_worksheet.pdfIn PDF document text
    • https://pizudakuputip.weebly.com/uploads/1/3/5/3/135347645/zaduwem.pdfIn PDF document text
    • https://fimulumalopa.weebly.com/uploads/1/3/5/3/135326017/86e8506f1dc676.pdfIn PDF document text
    • https://wusikizojig.weebly.com/uploads/1/3/4/8/134883510/46bb1cd84707.pdfIn PDF document text
    • https://dubanivexog.weebly.com/uploads/1/3/4/3/134331992/92e60a5ab4.pdfIn PDF document text
    • http://gilumesu.mypressonline.com/vizatilozixokobusa.pdfIn PDF document text
    • https://bilezebije.weebly.com/uploads/1/3/4/3/134344171/tinif.pdfIn PDF document text
    • http://bunutib.mywebcommunity.org/business_culture_definition.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/xilasisefi/gutozuge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52c8c0ee-be3f-4b8f-9f6f-d27c84c83137/cantos_la_luz_del_mundo_coro_de_guadalajara.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e84a061-54c7-4721-a132-94245d25ef9d/29028199796.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7657d5a3-694e-416d-a16c-5c6657c1d823/how_to_make_a_childrens_toga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca5d4a1d-7f67-49da-bfaa-5218dd2429e8/52376599029.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/828c8fe7-321c-48f0-aff1-7f7a846869e3/birukobegefaja.pdfIn PDF document text
    • https://eae964be-cf9f-49a8-9b2f-00020d526acb.filesusr.com/ugd/e932cf_808a326801394802bd30241fa17d3adf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfb6b535-b5c2-4c65-a16c-df7f8dcba38a/noluvomarowitorimuxuxon.pdfIn PDF document text
    • http://wenulusevikofa.myartsonline.com/botaxozijerina.pdfIn PDF document text
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_191180fd7c7e4d53a595b864795add2a.pdf?index=trueIn PDF document text
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_d03f6fa461334db0b8e6974747cb1852.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/65cb60ee-949f-40f0-8b5b-3d1678bb07f8/shakespeare_sonnet_1_sparknotes.pdfIn PDF document text
    • https://30372bae-fb3d-4285-bee0-d91e70c22047.filesusr.com/ugd/835091_f66123b97dab4a47816cb2a5dc1826bb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d02b3e7-3dff-4a2e-b78a-24519fa811d7/digitech_rp_255_manuale_italiano.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/darefaborodukudesanuk.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_off0000fe44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE44 5168 bytes
SHA-256: cdd9192a9174acded63e352f595525c9de9f4d413d9327556f4bbf8184bb9261
font_01_sfnt_off00010fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD0 3408 bytes
SHA-256: 9ab60772847634d58d4fda8bb50cf0aa6ac076d8429df4aa6ebff5cf179fe9eb
font_02_sfnt_off00011d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D22 11796 bytes
SHA-256: 100940d2aede63bf0a0475be86c307c569003ccae71b07ffc9bc809f4b012297

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