Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db9cccc027129f8…

MALICIOUS

PDF

79.8 KB Created: 2021-03-29 04:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 19058dc891bd67e1fbfd3c282091beaa SHA-1: 26931c7306527fdbdb8ae19a508ce85fdbcbf31e SHA-256: 9db9cccc027129f8f87091d3efd2ecb3ca120c2691f21b3d3257eb8c77e5510c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://baarspo.ru/wix?keyword=in+the+womb+worksheet+answer+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403128/normal_60000ed109d6d.pdfIn PDF document text
    • http://jomotew.iblogger.org/65049249509.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453335/normal_602f5666a2841.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486745/normal_5fe5ed6d752a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404723/normal_5ff0e9798967e.pdfIn PDF document text
    • http://palefazorubo.22web.org/l_t_limited_annual_report_2016-_17.pdfIn PDF document text
    • http://nejamaranidirit.22web.org/55229356248.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/ghcmPif/32194378224.pdfIn PDF document text
    • https://cdn.sqhk.co/duwenaxiseve/TiaijIm/39806321101.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407064/normal_6026a62ad8e9c.pdfIn PDF document text
    • http://poxexududojal.66ghz.com/zitar.pdfIn PDF document text
    • http://xepekil.iblogger.org/boston_scientific_latitude_6290_manual.pdfIn PDF document text
    • http://tulusujubige.mygamesonline.org/koxufukafeb.pdfIn PDF document text
    • http://godubumoze.iblogger.org/50707360018.pdfIn PDF document text
    • https://cdn.sqhk.co/tirazirevemu/fihaQ38/xosowolijosu.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/eK4Hjc1/my_verizon_blocked_numbers.pdfIn PDF document text
    • https://cdn.sqhk.co/sevafeluba/rqieggK/92185525310.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tigufot.rf.gd/structure_and_functions_of_proteins.pdfIn PDF document text
    • http://fijinibegomiba.rf.gd/goxadora.pdfIn PDF document text
    • http://golinab.rf.gd/vuvega.pdfIn PDF document text
    • http://piwapikefiraxi.rf.gd/does_ffvii_remake_work_on_ps5.pdfIn PDF document text
    • http://wonanikapudidak.atwebpages.com/what_can_you_mix_with_air_in_little_alchemy.pdfIn PDF document text
    • http://widagutevutedik.epizy.com/74191875089.pdfIn PDF document text
    • http://zuzumijeragevud.rf.gd/raxip.pdfIn PDF document text
    • http://semeruxola.epizy.com/statistical_quality_control_by_mahajan_free_download.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_off0000f5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D2 5228 bytes
SHA-256: 4e076d7225413fee882ad5b71138e22c6b12c9f50770648b99c0cd2e3da412f6
font_01_sfnt_off0001077d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077D 12176 bytes
SHA-256: ac9a3786d7d9ec3222fc050df75de34bcec33179d643756bad7f8173cb0ebd07

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