Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d71a81489f2ea0…

MALICIOUS

PDF

85.3 KB Created: 2021-09-13 13:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6dd243ed3eef63e6654791dd2a87f925 SHA-1: db9f89a74300986af5a8d8b470c9b9fa7c9bf466 SHA-256: 55d71a81489f2ea0cba7d75f509f20b506af548db78eefaf910000cb2265ef45
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, some of which are hosted on disposable domains or use IP literals, suggesting an attempt to redirect the user to malicious content. The heuristic 'PDF_RANDOM_URL_LINK' specifically points to a PDF hosted on 'childrencareandliteracysociety.org', indicating a likely phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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://garglob.ru/uplcv?utm_term=contagion+full+movie+with+english+subtitles PDF link annotation
    • http://dxczx.com/ckfinder/userfiles/files/20210906_004233.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/vikejinikinozijem.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/sakewegadovivikujakufigoz.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/xufuvujadufojimirugekebot.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/29404612953.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff8e396a7f---81600209961.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/072027296160.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/mobixogolenidututubizaz.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/kobekumumavabatuxo.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210910050804069.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/detatepomexop.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/rulepituxumeg.pdfIn PDF document text
    • http://hmed.vn/upload/files/danivefiw.pdfIn PDF document text
    • http://machulski.com/public/file/bezasugefofopun.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/12359747737.pdfIn PDF document text
    • http://fohow77.ru/upload/file/7980096325.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/tuvumulizukujitilu.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/texudo.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/fbc0fa945aebe547c8a1e7a31322b47d/xiwulikexoxukakulirekatam.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/xumevotosonotivezafeto.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/dinakajupekat.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/xumif.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/64008567159.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16137b502cf003---12724108067.pdfPDF link annotation
    • 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://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_off0000de70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE70 21220 bytes
SHA-256: 0952fc88a1b3cb7e4f94bd7fa2db78942a2ab2d1b0700342f4ed39ba498e8e9b
font_01_sfnt_off0001160b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160B 10984 bytes
SHA-256: d5319bef799ed8a0b4845f12842e94abc74633222c58af116857d99514d30c62
font_02_sfnt_off00012f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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