Malicious PDF — malware analysis report

Static analysis result for SHA-256 de92e3ad55b16dd8…

MALICIOUS

PDF

81.2 KB Created: 2021-09-20 01:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 212940ba66a2954440a9b2dd2af0bba4 SHA-1: 4dd5a7fbddb426a75c39c1b604434396cd02d319 SHA-256: de92e3ad55b16dd89a178655f5431ff0802edf016ff3a4e9bc7bf86a7c40ef5e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to external PDF files, many hosted on suspicious domains, suggesting it functions as a link farm. The presence of a disposable link farm heuristic further supports this, indicating a pattern of distributing links to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://metallpress.info/files/sorarate.pdf In PDF document text
    • http://hotel-ambassador-nice.com/upload/files/wuniw.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/tivetomasaloforisoravowa.pdfIn PDF document text
    • https://dellrein.ru/content/file/fajobebisenebevebagazesa.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/sawipedapulipelu.pdfIn PDF document text
    • https://hssanesteban.cl/files/zinar.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///28998039078.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/mawolukexetutorirotefo.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/1107921940.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/bimatawogumurare.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/wajexajobikekugibiwutix.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/99272375728.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/66779305489.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/32411237380.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/68035641282.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/bexiwitewalulixebamizopad.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/legotekalopuzuzagonun.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/zoxotodoful.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/92160124420.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/28321895681.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/sotonomuxoxumusolijomakig.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/20883400882.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/guxisutaxelaja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=maxis+4g+apn+setting+for+androidPDF 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_off0000d42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42B 10800 bytes
SHA-256: 5deb79d924ec711750e9a41d99de3f443367cb4726787a0f24dcdbd8bf833054
font_01_sfnt_off0000ed07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED07 19380 bytes
SHA-256: fd5b448eb82fe6796105cc1861f08eb70385e346387abf67b8f3f528f1c21be0
font_02_sfnt_off00011fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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