Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7565707afa2388…

MALICIOUS

PDF

129.1 KB Created: 2021-03-06 18:33:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 98b6c01d824a1456b0ec5c20cfabe914 SHA-1: 28473d76735037c592f7711e4323af8808465d4e SHA-256: ef7565707afa23881e38e7b970d956d793bfb18400b9cf878216be8484724f76
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters suggests a phishing or spam campaign targeting specific keywords.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://midufefew.ru/strik?utm_term=city+of+ann+arbor+zoning+codes PDF link annotation
    • http://ital-girl.space/53193659606vs4s6.pdfIn PDF document text
    • http://rubka.space/kydex_ar_15_mag_pouch_molle45c5n.pdfIn PDF document text
    • http://rowexusaje.mypressonline.com/26273654063.pdfIn PDF document text
    • http://sberpodarok2020.online/tank._io_unblocked_at_schoolc67s3.pdfIn PDF document text
    • http://bevubupowin.22web.org/metuburimu.pdfIn PDF document text
    • http://jetavimazi.22web.org/zuwalabirizufarixefumo.pdfIn PDF document text
    • http://xamejaduxak.22web.org/bible_nkjv_for_pc.pdfIn PDF document text
    • http://rmk4sale.xyz/bore_tech_bore_guide_reviewcmp0s.pdfIn PDF document text
    • http://clipshd.design/fafepanupujasidezapoqjb8f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mirepili.epizy.com/bootstrap_datetimepicker_date_format_dd_mm_yyyy.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/free_illustrator_infographic_template.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/70256091082.pdfIn PDF document text
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_c7a3448821ae404b92375988e7be5957.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/brownie_guides_promise.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/washington_gas_light_company_annual_report.pdfIn PDF document text
    • http://gezewezelatemak.epizy.com/alexander_fleming_biografia.pdfIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_e55f25d6f0b840acacd7c8a26980bc28.pdf?index=trueIn PDF document text
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_0216bebabc4245548a9324a65f204f55.pdf?index=trueIn PDF document text
    • http://solezod.myartsonline.com/zoom_a2.1u_manual.pdfIn PDF document text
    • http://rodedewezijore.atwebpages.com/3402300929.pdfIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/56390924439.pdfIn PDF document text
    • http://kapirexazi.onlinewebshop.net/norma_buen_inicio_del_ao_escolar_2019.pdfIn PDF document text
    • http://savikolapuxol.rf.gd/sirapotumopagesunaru.pdfIn PDF document text
    • https://dba0ca6b-c979-46b3-87c9-041648dee063.filesusr.com/ugd/6f58fb_05d65f84c34846f5a72780776d8ee9b6.pdf?index=trueIn PDF document text
    • http://nijetazum.epizy.com/mercedes_e350_convertible_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/98950880193.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_off0001b918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B918 5352 bytes
SHA-256: de6c3174ac591cacac196b876e572fe96ec8831882e6aff284e15a0b678a6b3c
font_01_sfnt_off0001cb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB6E 12952 bytes
SHA-256: ea213968bde449455981c5f9574b046dcbafa590fc17a7898d22062503239656

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