Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd0c4044d386310…

MALICIOUS

PDF

116.9 KB Created: 2021-04-18 07:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ab54763d6cea6665ef20c8baf0386f69 SHA-1: 47416bcf290654ac441879495ef0fb82f8ce6b34 SHA-256: dcd0c4044d386310876290bcc797d2ba5363678ef691ddfef3b88b18991296ce
166 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and employs a social engineering lure to trick users into installing browser extensions or updates. The embedded URLs likely lead to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://xajibur.ru/strik?utm_term=windows+10+tutorial+2018+pdf PDF link annotation
    • https://vifegozotamideb.weebly.com/uploads/1/3/4/2/134236473/dasisanufodal.pdfIn PDF document text
    • http://lunamawel.22web.org/detexuxupof.pdfIn PDF document text
    • https://cdn.sqhk.co/wevexifimur/ahiqgiv/faith_family_church_live_streaming.pdfIn PDF document text
    • https://nuvoligugepujo.weebly.com/uploads/1/3/6/0/136092189/3005249.pdfIn PDF document text
    • https://cdn.sqhk.co/xifinelire/hllxjah/knight_of_swords_thoth_deck_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/kedilexele/hfgiBag/star_wars_battlefront_2_ragdoll.pdfIn PDF document text
    • https://pikoxujedogusu.weebly.com/uploads/1/3/4/6/134665618/3924118.pdfIn PDF document text
    • https://solujasamaro.weebly.com/uploads/1/3/4/6/134695729/benutezemaw.pdfIn PDF document text
    • https://cdn.sqhk.co/misumirotoj/jgcLEen/samsung_laptop_warranty_check_by_serial_number.pdfIn PDF document text
    • https://zogadinarele.weebly.com/uploads/1/3/1/4/131409244/xufumemujakage-bewegiti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rosajeku.myartsonline.com/algebra_lineal_matrices_y_determinantes_ejercicios_resueltos.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/komplikasi_anemia_megaloblastik.pdfIn PDF document text
    • http://wobudesupak.epizy.com/ganesh_aarti_songs_telugu.pdfIn PDF document text
    • http://wororezijetixa.atwebpages.com/vibaxibikewikadobojoxum.pdfIn PDF document text
    • https://6e678f60-abc6-404c-883a-cd1729fdffee.filesusr.com/ugd/e4291f_0fb22f0fa52d47a989932dbee28998e6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/foneniz/37089471053.pdfIn PDF document text
    • http://lawubipala.epizy.com/spotify_web_player_android_apk.pdfIn PDF document text
    • http://biwagevaku.epizy.com/rifugazunilubupu.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/79736277803.pdfIn PDF document text
    • http://buzezozamedat.rf.gd/metric_bolt_standards.pdfIn PDF document text
    • http://dijuvunote.onlinewebshop.net/fekufupenalinil.pdfIn PDF document text
    • http://zugepoguj.onlinewebshop.net/glory_glory_hallelujah_satb.pdfIn PDF document text
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_447ad16d3dae4a59b9c30b5dbadcf4be.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17550 5660 bytes
SHA-256: f455673562be0f4dd21911c10f84213066b04c098c00c48c4061659accb96852
font_01_sfnt_off000188c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188C4 11384 bytes
SHA-256: 2138865c6279758898f82ea5a3f3c0ed823b46a7dc6909dca244a0b63c13e06f
font_02_sfnt_off0001af92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF92 16288 bytes
SHA-256: 433f3fa8d3b734d5d8bee7068cf9802bfbacd2823fb5dec97db73b6c6efe4cf1