Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8203b5b9496c8ae…

MALICIOUS

PDF

81.6 KB Created: 2021-09-24 04:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dcf40c4005010501a7a88177694248ef SHA-1: dd12cde6af31d167bf5737065c4aa40b4714979d SHA-256: e8203b5b9496c8ae5c55b48c119f6fb5de0c66658a8305005c01bc9dec262730
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URLs pointing to disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://whitepalacegrill.com/userfiles/97484810206.pdf In PDF document text
    • http://artkulinaria.pl/sites/default/files/file/senube.pdfIn PDF document text
    • http://strandedtattoo.info/file/99481072254.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/tuful.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/dulow.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/raxelorodaga.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/51932206074.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/23034810873.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/tadumokobofesatogibej.pdfIn PDF document text
    • http://inica.org/files/file///kakunofipegute.pdfIn PDF document text
    • https://mu3yc792xh-rl1.com/contents/files/bokeninemuxuletu.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/42609565913.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/44271641191.pdfIn PDF document text
    • https://amityhr.com/userfiles/file/wuridajofasefe.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be44f44040---fajovete.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613683235e37a---pakekepi.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/sopeloxumosenilalufe.pdfIn PDF document text
    • https://debden.org/userfiles/file/In PDF document text
    • http://oskarmak.com/userfiles/file/loferuboxokujavalu.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/8068212838.pdfIn PDF document text
    • http://technocom.pl/editor/file/sujenilevebufiwaver.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/dudupiwefirixo.pdfIn PDF document text
    • http://hagithanh.hagigroup.work/data/media/files/29968022755.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/tarokofoxujaturirojowov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=watch+same+video+on+two+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_off0000dac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC7 10732 bytes
SHA-256: 3b25f0782d2037ee52cc32bc95d43fb96d18377fddf8e91ed9bfdb16fda884bf
font_01_sfnt_off0000f359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF359 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6B 17420 bytes
SHA-256: 4dbfc5bef640ac2c4e7141aed45341f147b9fef7057e37d39e4153ef4cced7c9

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