Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab453b10cb98be5…

MALICIOUS

PDF

94.6 KB Created: 2021-03-25 01:03:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 574fb2b02c969b8017c5dc750847024e SHA-1: 4d776d5c6938fea7f67794c5cefe7e4029cd6288 SHA-256: 4ab453b10cb98be5b607cd51bc29cf54d46c2cbdfc52497e189a514d1eef66f3
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' suggesting a large number of outbound links. The presence of 'Idsa guidelines hap/ vap' in the document body, combined with the 'SE_URGENCY_LURE' heuristic, indicates a potential phishing or social engineering attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for distributing further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pelibifir.ru/123?utm_term=idsa+guidelines+hap%252F+vap
    • http://slimerecipe.org/how_to_make_your_outfit_glow_in_royale_highzzmgs.pdf
    • http://olymptrade.buzz/falabixatigimeriap003.pdf
    • http://alcozerox.com/futiriv34ie.pdf
    • http://radogomi.mygamesonline.org/descargar_biblia_de_jerusalen_gratis_en_espaol.pdf
    • http://instapodarok365.site/23573360604ufsw.pdf
    • http://yazansoft.com/juzipoxesazaji8qo4e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/numunenoji/singapore_mathematics_worksheets.pdf
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_ddca3a4a8b5b421e9a1b42b88d2d1a1a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3aafb71e-73a4-4f70-98e1-2216b1e90fe9/salisodonofivuparusum.pdf
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_8d0befa218f6455eb6eb8c2cb251d3f0.pdf?index=true
    • https://s3.amazonaws.com/wujodibu/41608973565.pdf
    • http://fukuselumetu.myartsonline.com/judememudusaxixuvavor.pdf
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_e9bdd193c82e4c108ad2d7e652a9cd14.pdf?index=true
    • https://s3.amazonaws.com/donake/xarigavilamukafefiniter.pdf
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_cdaca679a6004b1d97ca81b78551aa4c.pdf?index=true
    • https://2172aa7b-56d6-4bcb-a12f-aafeda7c7725.filesusr.com/ugd/0d9129_2699abb41f2e4230ae84e1074aedcb49.pdf?index=true
    • https://96daf755-36ed-4ece-a185-bed8db3f70ea.filesusr.com/ugd/a95cda_cc4830924ad84f74aef58d596ed85793.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d7352eb8-0f72-4abd-b175-ac96572415e6/how_to_clean_my_lazy_spa_filter.pdf
    • https://uploads.strikinglycdn.com/files/12e7fb29-4ba9-44cf-9d81-1508ff6a0dc5/how_to_install_honeywell_furnace_filter.pdf
    • https://uploads.strikinglycdn.com/files/52585508-d03c-4578-9faa-7ac2cca462e4/72250969296.pdf
    • https://ff102949-4c65-4b7b-925c-ea9a98d885fa.filesusr.com/ugd/7a16bb_9a69c3865f2c4375a658eb06d9da0bdb.pdf?index=true
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_0469d2727b94470aa3f2db9fd79c0a38.pdf?index=true
    • https://s3.amazonaws.com/bidivo/email_template_outlook_shortcut.pdf
    • https://07bd7893-a6ec-44d5-90fe-c719e602c0bd.filesusr.com/ugd/aafaff_51e0e51aa870418cb30d95797c2c9cbe.pdf?index=true
    • https://s3.amazonaws.com/xefezesebusu/91525847893.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013435.bin
c41f8ce503cb8575a2dec4d5df539b1ac1333729c73660ae234832be9174fac4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13435 5156 bytes
font_01_sfnt_off000145cd.bin
fda6c7bee44ab89698016c0656973fab59b0cdd1dcd75ff2706e17610317a46f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145CD 11560 bytes

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