Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a1a4de937b62d37…

MALICIOUS

PDF

75.0 KB Created: 2021-09-12 01:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 69c8ffec9a8e504dddc2aaab6ba00da6 SHA-1: 23b43558ad96f6ade2b64e95ff23774945664ac2 SHA-256: 1a1a4de937b62d37ae96783acd5fcfbbb92b937f95ed9ff263e557e961d6d0ef
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to other PDF files, indicating a link farm or redirection mechanism. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of distinct hosts suggest a non-standard purpose, likely malicious. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, possibly involving exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://specializedfacilitymgt.com/public_html/userfiles/file/99066989204.pdf In PDF document text
    • https://mebelihome.ru/upload_picture/tevig.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/difobesef.pdfIn PDF document text
    • http://marketingnews.fr/images/file/mofovaligufiberibu.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/mixalolepijunuginifuma.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/saralaju.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/luzotasomatadok.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/81404023424.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/zimixatevenifosulasobigi.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/86702849841.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/lazedifaxorulib.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/83631029307.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/kuvupoduxagu.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/83515292210.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/lisafivaviwifebomo.pdfIn PDF document text
    • https://ijpdua.com/contents/files/83114389117.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134219445479---24128346518.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/ripawuxujezukix.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/28162460617.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/74981035481.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/poxiditupija.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/78934196913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=doraemon+repair+shop+seasons+mod+apkPDF 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_off0000c212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC212 17124 bytes
SHA-256: da46ba0712539c4551bf09f26d003ba3264a26aec8f9ea8ba190a9ca536b6904
font_01_sfnt_off0000ee39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE39 10604 bytes
SHA-256: 7aaa3fef94ecee7734d88f67d6952f01f404606f42eb0fa2ef66431c213d325c
font_02_sfnt_off0001062c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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