Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ac0c646aa2d9a1…

MALICIOUS

PDF

81.6 KB Created: 2021-02-28 12:56:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: aa31e2bb579d662203d70d9477eb2ad1 SHA-1: ecfa9b98ee043c6e808488a908ce82b223a164bb SHA-256: 37ac0c646aa2d9a1de705aa7fddecc68f6b826652f3d28affade2c9f1890c077
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to suspicious domains, with one heuristic specifically identifying a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of numerous obfuscated links and the document's structure suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=army+gold+master+download In PDF document text
    • http://trikolor.site/ratoxadelagawukiorwox.pdfIn PDF document text
    • http://rotixumuzu.22web.org/medicare_part_b_reimbursement_differential_request_form.pdfIn PDF document text
    • http://magic-spring.com/jopapuvekisupiparo9pbys.pdfIn PDF document text
    • http://lnstagramverifiedbadge-form.com/kozuwewutujizikopivojidal0e5h.pdfIn PDF document text
    • http://zakofuta.66ghz.com/piwatelumasevalu.pdfIn PDF document text
    • http://thailandlove.site/52050375833dtydv.pdfIn PDF document text
    • http://tijudozi.scienceontheweb.net/riwisinunepivom.pdfIn PDF document text
    • http://fdvsefwfrw.space/bootstrap_4_admin_dashboard_templatesr63id.pdfIn PDF document text
    • http://totalcreditreport.info/what_radio_stations_play_old_country_music20uvm.pdfIn PDF document text
    • http://eu-study.ru/vepozeronumukevilosijikamlc0mx.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/bumiwarijon.pdfIn PDF document text
    • http://cozyplacefor.rest/homonyms_worksheets_2nd_gradeeayok.pdfIn PDF document text
    • http://studytogether.fun/2009_buick_enclave_owner_s_manualiqrcr.pdfIn PDF document text
    • http://mutinujevax.22web.org/network_access_control_system_management_software.pdfIn PDF document text
    • http://arm-watch1.club/867178114070lah9.pdfIn PDF document text
    • http://igoscandinavia.com/dixodawibowabexideduvanabu2deq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuwolerapole.epizy.com/dowanuwan.pdfIn PDF document text
    • http://vilaxetewutino.epizy.com/python_format_integer_into_string.pdfIn PDF document text
    • http://kulivobelokogun.epizy.com/vefebowiwunamex.pdfIn PDF document text
    • http://wafubarig.epizy.com/xewozadebotugisojokiwomub.pdfIn PDF document text
    • http://rolaxaja.rf.gd/xisufafoluriwilikop.pdfIn PDF document text
    • http://jevejizodirosaw.epizy.com/juzukudo.pdfIn PDF document text
    • http://tugoxejemikoze.epizy.com/49004687342.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_off0000fef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF3 5328 bytes
SHA-256: aaedff81e26f34b551f7678140ca03acc407a5a6200beca03455732852493430
font_01_sfnt_off00011111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11111 11088 bytes
SHA-256: 72de129d016c7217ec87f98fdf26056b1deedc2a31534d378ebbd753b7838d4f

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