Malicious PDF — malware analysis report

Static analysis result for SHA-256 178b18e9c91be3bd…

MALICIOUS

PDF

88.0 KB Created: 2021-06-10 14:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: eab721abb7fedb1e02d9f5fdc82240a6 SHA-1: e1223a4e389091216f74e306f10c3a64e73ee58d SHA-256: 178b18e9c91be3bde69858b4316e9b25abc1ca32a7e10c6720c017aa64341e8b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one pointing to a suspicious domain that appears to be part of a link farm designed to obscure the ultimate destination. The document body is heavily obfuscated, but the presence of external URIs and the overall heuristic firings suggest the PDF is designed to redirect users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/123?utm_term=video+bunga+citra+lestari+kecewa PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4415519/normal_5fee62f7c3f74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378619/normal_60185166a494f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408976/normal_5fd63d0d61474.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483346/normal_5fe23ea76e57b.pdfIn PDF document text
    • https://wusafasugulub.weebly.com/uploads/1/3/4/5/134586051/saboxojafurowuwisan.pdfIn PDF document text
    • https://jejedutetobi.weebly.com/uploads/1/3/4/6/134662716/1033714.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475376/normal_601cff825b924.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448744/normal_606c919d10fa3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pifiloxema.pbworks.com/w/file/fetch/144712431/formato_pago_de_tenencia_estado_de_mexico_2020_costo.pdfIn PDF document text
    • http://xuresasadox.pbworks.com/w/file/fetch/144445377/hazard_identification_and_risk_assessment_method.pdfIn PDF document text
    • http://bowawesup.pbworks.com/f/sonic_the_hedgehog_new_movie_coloring_pages.pdfIn PDF document text
    • http://zowonixepor.pbworks.com/w/file/fetch/144681231/fm_whatsapp_original_apk_download.pdfIn PDF document text
    • http://jojekepodef.pbworks.com/w/file/fetch/144769410/91337054027.pdfIn PDF document text
    • http://fixunomavow.pbworks.com/w/file/fetch/144793158/90116564208.pdfIn PDF document text
    • http://rubuxesi.pbworks.com/f/birewonufoxutatole.pdfIn PDF document text
    • http://fatakalewene.pbworks.com/f/62737842591.pdfIn PDF document text
    • http://pebenuziwi.pbworks.com/f/51097763411.pdfIn PDF document text
    • http://mukonisu.pbworks.com/f/nobitewipunelaxivitume.pdfIn PDF document text
    • http://nubuzefi.pbworks.com/w/file/fetch/144603234/53338664813.pdfIn PDF document text
    • http://jeveriwilum.pbworks.com/w/file/fetch/144835329/55812549629.pdfIn 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_off0001037a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037A 5368 bytes
SHA-256: 4930de05abb1a33d19f68833c6c662755e20568629dc7ae9232017ee5e15072e
font_01_sfnt_off000115e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E1 11700 bytes
SHA-256: d639243963d03bcb89730c29d7f07437e9b3212918a3bba162c2dd8b4d92538b
font_02_sfnt_off00013d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D78 16060 bytes
SHA-256: d78d7cc1a68daa951b4fbccbcfb906d5a08ad384f187125596154666a45abe72

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