Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f3625b108900d78…

MALICIOUS

PDF

79.3 KB Created: 2021-03-20 00:51:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: b951c7dde61445db02381fd220e8c16e SHA-1: 9449a57772541d16b296cad0dd38feadb647e84d SHA-256: 7f3625b108900d7822b210311d71733daf686ae56d31cd8a99e319dd8ada17b1
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with one specifically pointing to a URL that appears to be a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to trick users into downloading further malicious content.

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
  • 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://nipisod.ru/award?keyword=oxford+dictionary+book+free+download+pdf PDF link annotation
    • http://ruroraratotu.66ghz.com/androids_cell_saga_eza.pdfIn PDF document text
    • https://sogazefod.weebly.com/uploads/1/3/4/0/134000298/veminuzowuwizem.pdfIn PDF document text
    • http://outputqwvk.space/easy_bow_maker_instructions1kgdw.pdfIn PDF document text
    • https://likemojinefafus.weebly.com/uploads/1/3/1/4/131406739/7167951.pdfIn PDF document text
    • http://creditstar-kabinet.com/71459715577bw83t.pdfIn PDF document text
    • http://olx-delivery.cc/technicolor_tc8715d_firmwarez05qt.pdfIn PDF document text
    • http://kameregeperiwaz.22web.org/brockville_police_reports_august_2019.pdfIn PDF document text
    • https://zuzesewijolane.weebly.com/uploads/1/3/1/4/131406438/jimorexulefekol_wukurafa_likabigejiviri_lejutuxili.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_11264b6c2d444ff3b1f8d91c8324c7d5.pdf?index=trueIn PDF document text
    • https://9eb5ee95-128e-4115-bcd6-d8db8525ce49.filesusr.com/ugd/9904c2_4a87c338e5ea45b9b852d7f0f67740aa.pdf?index=trueIn PDF document text
    • https://104e0e48-a4c2-4a03-8647-06ef64d4e6ac.filesusr.com/ugd/e2c6c1_45b7282ffb204674841e05dfe5f7dce0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/ti_84_plus_games_mirageos.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/50147531754.pdfIn PDF document text
    • https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_eb37c8f802d245c3a9fcb368e1fda1f4.pdf?index=trueIn PDF document text
    • http://dosunadis.epizy.com/cisco_switch_3850_datasheet.pdfIn PDF document text
    • https://d7179dab-c972-4501-9f4a-16044ca71e84.filesusr.com/ugd/434f74_b8e705bc60ad4072b52310a18471448f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/2017_chevy_cruze_hatchback_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/lovopiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56292489-4009-4313-b9b3-d89006ea9b9e/how_to_reset_dlink_dir_825.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e966b071-514a-495d-acd6-aa67cef661a6/lehninger_principles_of_biochemistry_6th_solution.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/caffaro_industrie_spa_report_aziende.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_off0000f74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74C 5464 bytes
SHA-256: 35f4bab5fe3f6930130d1e77023b88131d6058f24586e9f5646143ee7e8fd8d7
font_01_sfnt_off00010a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0E 11168 bytes
SHA-256: 50449de0aca4989a7d052e1800bce083a5f4ab3876034eb5045d22a693ea0405

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