Malicious PDF — malware analysis report

Static analysis result for SHA-256 fae1944a4e2e3989…

MALICIOUS

PDF

69.9 KB Created: 2021-10-04 01:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 37193e14d4f367ff90fd4f28f059bc2b SHA-1: 8bc05dc2bad7a0e68433331dae03ceed5645fd3c SHA-256: fae1944a4e2e3989c5d0ebcc55562d98211ad04b6a2cfa585a70a67e2e08bc3d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is used to distribute links on disposable hosting. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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://abisspaandboutique.com/nbloom/fckuploads/file/suzosurog.pdf In PDF document text
    • http://greenld.com/userfiles/muvule.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/mireti.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/fidedisatuje.pdfIn PDF document text
    • http://hnyinfeng.com/d/files/81987112425.pdfIn PDF document text
    • https://fac.apuntoweb.com/userfiles/files/57257582996.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ddb962ee0---mefekiletew.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/11065469163.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/tasirevilujer.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/23113675783.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/51781161146.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109151920413588.pdfIn PDF document text
    • http://oris-am.com/editor_up/kejomubus.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/38688032207.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/liwufonixumisilap.pdfIn PDF document text
    • http://etnorom.hu/pictures/xejazit.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/nimogulipusamudere.pdfIn PDF document text
    • https://anjingliar.com/contents/files/95697190003.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/vajesasuxaboxusaso.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/safetepo.pdfIn PDF document text
    • https://eklyps.net/images/file/56742803327.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/pezuzowerep.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/11961741924.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/23329975197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+many+vertices+does+a+pentagonal+pyramid+havePDF 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_off0000af1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF1D 11216 bytes
SHA-256: c92295f811598efb3d030666f11faf8ac2e422a326273e01095a34a6f80d011b
font_01_sfnt_off0000c8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FF 16244 bytes
SHA-256: a624f7a720b7cd716effa43a437d9ca43acd576cb36b3ff6b3bf17d3cf5e1c49
font_02_sfnt_off0000f1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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